More specifically a very large number of dodgy companies spend a relatively small amount each but in aggregate it's a lot of money.

Google has no interest in policing that because money and won't until they are forced to and since they are a transnational that's difficult since it requires multiple countries to do it with the added wrinkle that if you even hint at the possibility that just maybe you might consider doing something about US big tech you get immediate screaming from across the Atlantic.