There's not really a good answer other than convenience. Folks view Steam as the benevolent convenient monopoly. They want it to be their store for everything, their launcher for everything, their friends and social networks for all gaming on PC and what not. Epic is behind on feature parity and function, but even if it did have parity, I think gamers still want the convenience of one store/library/friends list.
Pure speculation: of the people who don't like Epic, maybe 25% are legitimate, principled objections to their business practices. The rest are split evenly between people who just want to manage their entire library on a single platform, and folks just going along for the hate-ride because it seems like the "safe" position to take.
From a technical stance, Steam and GOG are superior platforms (for different reasons). For equal-price purchases, I can't think of a single reason to choose Epic over other options. But claiming a game for free? That doesn't make anyone a bad person.
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