Alphabet has claimed to be fighting ad fraud for many many years.

That is not how an organization fighting ad fraud would structure itself.

Alphabet does not have an abundance of technical incompetence. But it does have the strongest of incentives to ensure ad budgets get spent quickly and no meaningful disincentives.

I mean what’s the OP going to do, go to Google’s competition?

Google is also competent enough to know that taking spam & fraud seriously is incentive-aligned in the medium term. See https://en.wikipedia.org/wiki/The_Market_for_Lemons.