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.