Digital Ad Fraud and the OOH Advantage

Originally published February 4, 2016. Updated August 2026.

Nearly a decade ago, we wrote about a growing problem in digital advertising: advertisers paying for impressions and clicks that were generated by bots instead of real people.

A lot has changed since 2016. Digital advertising has grown dramatically. Programmatic technology has become more sophisticated. Artificial intelligence is reshaping how marketers reach consumers.

Unfortunately, ad fraud hasn’t gone away. It has evolved right along with the technology.

And for advertisers deciding where to invest their marketing dollars, it raises an important question:

How confident are you that your advertising is actually reaching real people?

Digital Ad Fraud Is Still a Very Real Problem

Digital advertising offers marketers tremendous targeting, flexibility and measurement capabilities. But its complexity can also create opportunities for wasted spending and fraud.

Invalid traffic, commonly referred to as IVT, can include automated bots, fraudulent impressions, fake clicks and other activity that doesn’t represent a genuine consumer engaging with an advertisement.

Recent research illustrates the scale of the issue.

Fraudlogix analyzed 105.7 billion digital ad impressions from 2025 and found a global invalid traffic rate of 20.64%. Its Q1 2026 analysis of another 26.3 billion impressions found an IVT rate of 18.12%, meaning roughly one in five impressions in its sample showed signals of fraudulent or non-human activity.

Other research has found similar challenges within programmatic advertising. Pixalate reported a 19% global invalid traffic rate for desktop and mobile web programmatic advertising in Q2 2025, while its U.S. data showed a 21% web IVT rate and a 24% rate for mobile app traffic.

The numbers vary by study, platform and methodology, but the larger message is difficult to ignore: advertisers still need to pay close attention to the quality of the digital traffic they are buying.

AI Is Making the Issue More Complicated

Artificial intelligence is bringing tremendous opportunities to advertising, but it is also giving fraudsters more sophisticated tools.

The Media Trust’s 2026 Digital Advertising Intelligence Report identifies AI-driven fraud among the evolving threats facing digital advertisers, including malicious advertising, cloaked landing pages, phishing, malware and increasingly sophisticated techniques designed to evade detection.

DoubleVerify has similarly warned that generative AI can make it easier to create content farms, clickbait and made-for-advertising websites designed primarily to generate advertising revenue rather than provide meaningful experiences for consumers.

That doesn’t mean digital advertising isn’t effective. Far from it.

It does mean marketers increasingly need verification, fraud detection, supply-chain transparency and strong measurement practices to understand what they’re actually buying.

OOH Offers Something Refreshingly Tangible

This is where out of home advertising provides an important advantage.

A billboard exists along a real roadway.

A transit advertisement travels through real communities.

A bus shelter reaches people walking, driving, shopping and commuting.

The inventory isn’t hidden behind layers of websites, exchanges and automated transactions. Advertisers know where their message is appearing, and the audience opportunity is tied to people moving through a physical market.

For many advertisers, that tangibility brings a valuable level of confidence to the media mix.

OOH has also become increasingly measurable. Audience measurement, mobility data and attribution tools allow advertisers to understand impressions, audience composition and, in some cases, actions that occur after exposure.

In fact, a 2026 study from OAAA and Kochava analyzing hundreds of campaigns found that OOH generated measurable outcomes ranging from store visits to website visits, app downloads and other digital conversions.

So while the medium itself exists in the physical world, its impact doesn’t stop there.

Real-World Advertising Can Drive Digital Action

One of the most interesting developments since we first wrote about click fraud in 2016 is just how connected OOH and digital advertising have become.

Consumers see an advertisement on a bus, billboard or shelter and then reach for the device already in their pocket.

OAAA research found that almost 90% of U.S. adults noticed an OOH ad within the previous month, while nearly 80% of viewers had engaged with OOH advertising in some way. More than three-quarters had used a smartphone to respond to an OOH ad, with search representing more than half of the resulting consumer actions.

That makes OOH particularly valuable as part of an integrated campaign.

An advertiser may use outdoor media to build awareness throughout a market and digital media to retarget, provide additional information or capture the eventual conversion.

Rather than competing with digital, OOH can help give digital campaigns something real to build upon.

Advertisers Are Taking Notice

Marketers appear to be placing greater value on that role.

U.S. OOH advertising revenue reached a record $9.46 billion in 2025, marking 19 consecutive quarters of growth. Transit was the industry’s fastest-growing segment for the second consecutive year, increasing 9.2%.

That momentum accelerated in 2026. During the second quarter, U.S. OOH revenue grew 10.7% year over year to a record $3.16 billion, and 73% of the top 100 OOH advertisers increased their spending. Technology and AI companies were among the brands investing heavily in the medium.

There’s something interesting about companies building some of the world’s most advanced digital technology increasingly choosing advertising you can see in the physical world.

The Outdoor Advantage Still Holds

When we wrote about click fraud back in 2016, we ended with a simple observation: advertisers ultimately want real people to see their message and respond.

Ten years later, that hasn’t changed.

Neither digital nor OOH needs to do everything. The strongest marketing plans often combine channels, allowing each one to do what it does best.

Digital can deliver targeting, interaction and immediate response.

OOH can deliver broad visibility, geographic presence, repetition and a physical connection to the communities an advertiser wants to reach.

And in an advertising environment increasingly filled with bots, algorithms and AI-generated activity, there remains something reassuringly straightforward about seeing your message on the side of a bus, at a transit shelter or on a billboard:

It’s out there in the real world, where real people can see it.