NextDNS

alternative to the already proposed solution is using adaway.

its obviously better if you are rooted but it runs well on unrooted phones too.

If you’re on Android, go to settings and network, find and enable private dns mode using this host address

dns.adguard-dns.com

It should block the majority of ingame/inapp ads, etc

Edit: Minor Caveat. This isn’t fool proof nor is it 100% effective.

But takes you all of 30 seconds and does not require root permissions, side loaded apps, etc. Its all about the cost benefit ratios.

Don’t use apps with ads. F-droid exists