Is ad fraud illegal?
Yes, deliberate ad fraud can be prosecuted as a crime. In the United States, operators have been convicted of wire fraud, computer intrusion and money laundering; the Methbot and 3ve ringleader Aleksandr Zhukov was sentenced to ten years in prison in 2021. Many cases are also pursued through civil lawsuits, platform bans and contract clawbacks rather than criminal charges.
Criminal cases usually need a clear victim, provable intent and a traceable operator, which is why prosecutions are rare relative to the scale of ad fraud. The Methbot/3ve case, built with help from Google, White Ops (now HUMAN) and others, showed that large botnet and data-center schemes can be dismantled and charged. Platforms also sue: Google, Meta and Amazon have all filed civil actions against click-fraud and fake-account operations.
For most advertisers the realistic remedy is contractual: Refunds and clawbacks terms, the right to audit, and payment only for traffic that passes independent measurement. Grey-zone practices such as some incentivized traffic or aggressive traffic arbitrage may be policy violations rather than crimes, which is why contracts should define invalid activity explicitly.