Apreche parent
Pay for Apple Arcade. Games in there are guaranteed not to have ads, spam, or microtransactions.
I get Apple Arcade through my Apple One subscription. I am an happy customer, but also to be honest not much of a gamer. You won't get AAA titles on it (or even a large selection of titles).
If you're like me then Apple Arcade is a great service, but YMMV.
Oftentimes the games are just cleaned up versions of their microtransaction-ridden originators, bearing the same incentivisation mechanics just without having to pay money. So that's pointless then.
I loved the collection on apple arcade, but since I play maybe 1 game for 3-4 months casually, I couldn't justify the recurring cost.