I bought a no name brand battery for my laptop once off of ebay. Had zero problems with it. The battery life was like 1 year instead of 2 or something but otherwise it performed the same. Just make sure you pick a reputable seller or something with a lot of positive ratings.

My thought is leave them be. Downvotes and blocking should be sufficient if it’s bad enough.

My step son is 10. If I did this he would legitimately take 20-30 seconds to figure out the answer or have to count it out on his fingers.

He’s a few crayons short of a box, probably because he ate them.