Reviewing ads to verify that they meet their Acceptable Ads policy takes time. Time is money, so they charge for that time. Seems OK to me. That said, I use uB

Reviewing ads to verify that they meet their Acceptable Ads policy takes time. Time is money, so they charge for that time. Seems OK to me. That said, I use uBlock Origin because I think it's better written and also I morally object to advertising, so there is no such thing as an "acceptable ad" to me.