I had a simple game release countdown on the Google Play Store 1.5/2 years ago for an upcoming game release. I published the app on the app store I believe 6 months before release. By the time the game was released, I was collecting $35/day in ad-revenue (Through Admob). While I don’t remember the exact figures (The account has since been suspended ), I think I had something like 140k total installs , and maybe 70k current installs. A journey to say the least, and while I certainly wasn’t expecting to earn that much money from an app that took me an hour to make, I did. Now, is as many installs as I had viable? I’ll let you decide, but if I were to start publishing apps again, I would have to go with paid.
Regarding Adblock, it is very much a thing on Android devices, less so on Apple-made products.
Anyways, that’s just my input