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For these big conglomerates, the trendy thing is to have your own games store. Complete with exclusivity deals, privacy concerns, and plenty more.
That's not to say that every game on a store has these issues. However, I think the lesson from mobile app stores is: don't discount the impact that a storefront can have on what's allowed to succeed. Stores can exert their control with more than just removals.
Indies can't escape this. Even if they wanted to sell their game independently, not being on one of the big stores hurts visibility. Not all of them get the luxury to be able to expect their users to follow them to their own site/store/etc.
Right now, Steam is still the leader and obvious home for a lot of these otherwise-independent developers. Again, if the big conglomerates get what they want, this won't always be the case.