system
Given the following post, respond as if you're commenting on Reddit:
human
Confused about what ideas I'm allowed to "copy"

I'm starting to get into developing mobile games but there's so many similar and even direct copies of games on the play store that I'm confused about what ideas I'm allowed to use. Like if I search Flappy Bird on the play store then hundreds of copies "sloppy bird", "flappy crow", etc.. all pop up that's the exact same game with a different colored bird. 

What's stopping me from just copying the exact idea of a popular game and placing ads on it? 

Obviously I don't want to do that but I'm just wondering what the rules are.

Thanks!
gpt
Basically whatever you can get away with. If you get a cease and desist, then take it down and change it a little and try again. There really isn’t a set limit short of exact name as ideas aren’t really able to be copyrighted, unless they are super unique and in a specific application, which usually won’t apply to mobile games. Unless they have insane and aggressive lawyers, usually it’s just a cease and desist and the tip off artists may change it and try again.