It ought to be illegal for a 100B+ market cap company to operate in this way. They can just pour money at the problem until the incumbents shrivel up and die. Hyper fucking bad behavior that leaves the true innovators and people that care out in the cold.
On the other hand, it should be possible for consumers to claim products they own on different platforms by peering a list of their their owned (licensed) products.
The early 20th century put a lot of Monopoly and Trust Busting laws on the books that say some of this is illegal, not just "ought to be". What we've lost since then hasn't seemed to be the laws themselves but the willpower to regulate in the spirit of those laws and executive power to enforce those laws.
On the other hand, it should be possible for consumers to claim products they own on different platforms by peering a list of their their owned (licensed) products.