How do I remove apps from my iCloud?

That really is not cool!! When we first got the ipad we downloaded a lot of stuff because it was all new and interesting. My grandkids download games all the time, play them once and then delete it off the ipad but it stays in my iCloud. So now I have to pay for storage for old games that we don’t use and haven’t used in years if I want to do an update. It’s just not cool.