All the evidence we have today is evidence against your fear mongering. Steam have 99% or so of all games available on it. Epic have timed exclusives before being available again on steam etc.
Android have multiple stores and 99% use play store.
I don’t understand why you have a problem with stores paying developers to take a risk and stay exclusive.
99% of apps will remain if they want the best exposure, unless apple is so incompetent and unable to compete without abusing their position
We manage with retail stores and 99% of other online payments we do. The most user friendly will have all the users. Why do you think steam dominates EA, Ubisoft, windows store, GoG etc etc?
Common, it should be neutral.
Do you think the general public would want only Amazon to buy everything? Majority likely want’s options