Also not FOSS, but I'm using Summit.
It's the only client on Android I'm aware of that has mod-tools built in.

I use boost. it costs barely anything to remove ads

I think your ads got hacked.

Blokada, never seen a single ad in any of my apps. It's a battery hog, but it works like a charm since I can't get access to my router for a pi-hole.

The title is a little disingenuous. Claiming this is a property of the Boost app isn't correct... It's just an ad network.

I used my Google rewards credit to remove ads in Sync, because I ain't paying for that shit and they would have expired anyway.

As long as you go out every now and then (to shops or next to shops) and consistently answer the rewards stuff (doesn't need to be true it seems, just consistent) then you'll eventually be in the same boat as me and probably many others where you'll eventually have nothing to spend the rewards on as you'll have bought all the apps you need and will ditch the rewards in the end.

Sync, but it still has ads. Honestly just get an adblocker, it's free.

A paid ad-free Boost