LMFAO, I love when someone says they tried everything when it's so blatantly obvious they didn't really try anything.
Both Epic and Amazon seemed to believe that if you gave out enough free games then Steam would just... Disappear? Really really dumb.
Neither company has invested any time into making their launcher any good. They haven't invested any time into making their ecosystem feature rich like Steam. They have just given away a bunch of games and had sales and hoped that magic would take care of the rest.
Valve doesn't even have to try to beat the competition when the competition doesn't put any effort in.
GoG Galaxy is the only decent alternative launcher I've used and it's being maintained (seemingly) by one guy who only works one day a year. It's not as good as Steam by a long shot, but far far better than any of the launchers that come from companies WAY WAY bigger and wealthier. Even the itch.io launcher is better!!!
Blizzard, Amazon, Epic, EA, Ubisoft, and Rockstar (and more) all have their own launchers and not a single one is decent or necessary. Why make such an inferior product when Steam already exists?