Games development is very hit based and most games make nothing. You might think, "oh if most games make nothing, then thos won't make an impact", but if you'r

Games development is very hit based and most games make nothing. You might think, "oh if most games make nothing, then thos won't make an impact", but if you're removing the profit from the relatively few hits there are, it wrecks the incentives to take the risk of developing a game to begin with. If Unity wants a piece of the profits, they need to be investing.