I've been using systemwide adblock on all my electronics for years now so I forget that in app ads are a thing. But yeah, I see your point. They do offer a one time purchase to remove ads.
So far I've only had an issue with one game (easy to fix, I just restarted steam). I'm relatively new to Linux. (Switched because I didn't feel like paying for windows when I built my PC). To be transparent, I did use Linux a bit 5 years ago in school. But I don't think that counts.
Don't give them ideas