The scam is that they undermine the actually viable platforms by offering something that is literally too good to be true. Then when all their competitors are dead their store will go to shit and you won’t have an alternative. When the time comes, you will wish you’d spent some money on a real store rather than play for free on theirs. See enshittification.
Epic Games Admits In Court That Its PC Store Still Isn't Profitable (kotaku.com) angielski