Most discussions about CTV fraud start with threat actors, fake apps, or suspicious traffic spikes.
That is useful, but it misses a more expensive problem: bad fraud decisions.
If your fraud stack still treats one IP address as a durable identity, IPv6 is already making those decisions worse. That creates two kinds of cost at the same time. Fraud slips through when rotating addresses look new, and legitimate traffic gets penalized when broad network blocks catch more than they should.
That is not just a security issue. It is a business problem for the whole ad ecosystem.
A small watchlist, a useful lesson
