If people got their game on Steam and got to keep it, how did Epic cut it and how did people get screwed over? For the Kickstarter, did people pay to buy the g

If people got their game on Steam and got to keep it, how did Epic cut it and how did people get screwed over? For the Kickstarter, did people pay to buy the game and not get it while not being refunded? We're they promised a copy of the game while not receiving it?