This is an interesting topic that comes up time and time again. I'd like to understand, if we abolish copyright and I make a computer game, pour all my money an

This is an interesting topic that comes up time and time again. I'd like to understand, if we abolish copyright and I make a computer game, pour all my money and time in it, what's to stop EvilBigPublisher Co from simply taking it, rebranding it and killing my company with their might? Or, if I came across a copy of Unreal Engine, what would stop me from using it and not paying Epic a dime?