I have targetSDKversion set to API 33, but I am wonder if it still possible to set minSDKversion to 19 when you have admob or do you need to set minSDKversion to 21?
My all apps have Admob and the SDK target min = 23.
Checking the analytics, the Android 6.0 has less then 1% of installations.
I don't think that you get any valid revenue with setting target < 23.
Ads and everything does indeed work on 4.4.4, (actually it is the only place where i get proper save req wihotu ghosting files) but the problem I thnk is that the old systems do not ask before they serves ads. They just do it anywa and this crashes with the new EU law for ads. I think that is the reason why they increased the minimium API to API 21.