Epic has to pay publishers for exclusivity and most of the time still only gets one year of exclusivity. Steams strength was always the long tail, and personally I'm not that worried about getting games a year later.
EA (Origin) and Activision/Blizzard (Battle.net) have their own launchers and don't publish on Steam. But while those are some of the biggest brands it's a tiny portion of the overall industry: maybe 4-10 dozen exclusive games in Origin + Battle.net + Uplay + Epic Store, but a few thousand on gog and a few tens of thousand on Steam
EA (Origin) and Activision/Blizzard (Battle.net) have their own launchers and don't publish on Steam. But while those are some of the biggest brands it's a tiny portion of the overall industry: maybe 4-10 dozen exclusive games in Origin + Battle.net + Uplay + Epic Store, but a few thousand on gog and a few tens of thousand on Steam