Does it actually block ads in apps?

Blokada 5 blocks ads in apps and it was removed from the google store years ago. You have to sideload it in order to use it.

There's a neutered version on the google store, but it doesn't block ads effectively.

Google also removed an addon called Adnauseam, which clicked ads in additional to blocking them. That way, advertisers still have to pay site owners for your visit. Google removed it without justifiable reason, then kept it removed since there was no sufficient backlash.

It's the main reason why I switched to Firefox. That kind of abuse is for useful idiots.