I've never had any compliance issues with any other advertising network.
Google works hard to keep the ecosystem healthy because it's good for their long-term interests. But of course, their systems are not perfect.
https://www.statista.com/statistics/266210/number-of-availab...
37% fraud-rules breaking rate is pathetic. Maybe they should spend time vetting these things before allowing malware-infested spyware out into the "ecosystem."
This is a well-documented feature that has many legitimate uses. If you're trying to stop fraud, clip any gmail addresses after the +. For example, I believe Facebook does this.
There's no scarcity in available email addresses. If your security depends on people not being able to register new emails, you've already lost.