Not exactly answering your question here, but I shipped a mobile game worldwide about a year ago with both ads and ability to unlock whole game via purchase to unlock.
My ads are as unintrusive as I could implement (watching an ad via button press to unlock a level). So far I have seen mostly iOS users are willing to purchase the game while Android users will heavily lean towards watching an ad to unlock a level. From what I have read (and seen so far) it looks as though the way I'm implementing ads is going to be highly unprofitable
Additionally integrating ads in general was a huge pain in the ass. I initially looked to Unity, then Admob, and finally mediation of the two. Funnily enough at one point I looked at mediation via ironsource along the way as I had heard their Unity integration was pretty good.
If your curious as to the exact monetization mechanisms you can check them via my game below.