Google constantly takes 10-12% of adsense earning as "invalid traffic". Now we obviously dont use bots, we have real users, so i can only assume they consider

Google constantly takes 10-12% of adsense earning as "invalid traffic". Now we obviously dont use bots, we have real users, so i can only assume they consider those misclicks. Or something else, they have no transparency. The RPMs have been going down for a decade even as our traffic is stable, and slightly up during covid. They also don't fill our inventory. I wish we had alternative ways to find advertisers. I have yet to see studies confirming that the money that advertisers spend is made good on google marketplace or fb marketplace etc. Sure they may see 50% of it working, but what about the rest of it?