You realise that the other game platform wouldn't have that game that Epic bought exclusivity for, right?
You realise this was all done to avoid having to actually compete against Steam - and therefore actually having to make a decent product or do something that helps us - the consumers. I would like competition between marketplaces - to encourage cheaper games, better features etc., but that's a fight that Epic is scared to go into; hence the exclusivity deals.
It was and is a horrible practice, that should not be encouraged.