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Epic is the second largest online store by revenue, so you are objectively wrong by a wide margin. Users are spending a lot of money on the platform. Much of it goes to their flagship games like Fortnite. Similarly to how much of Steam’s revenue comes from their flagship games like Counter-Strike.
I don’t think feature parity would entice anyone across. It would need to be much better than Steam to entice migration, and it’s hard to conceive how much work and money that would require.