What's the issue people have with Epic Games Store?

The exclusivity-thing is a no-brainer for someone that needs to break into a market dominated by a behemoth like Valve. How would you suggest Epic Games Store grow the fastest with a big bag of Fortnite-money?

Sony plays this game the best and I don't see as many gamers complaining about their anti-competitive behaviour, despite being the biggest one...

Epic as a company is another thing completely though but is that why gamers hate on the Epic Store?