why didn't unity just do a percent of revenue after X income scheme like unreal for one thing people have a harder time with percents than "I need to pay you a quarter every time someone installs my game"
Because they wanted to milk free to play games dry. And they probably did not realized that "pay per install" means "infinite money". They did want to charge developers for webgl apps too, so it would be "20cents per page opened". So they are probably retarded and greedy as fuck. en.wikipedia.org/wiki/Window_tax
I think they did. They don't take a cut until $200k I think