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This is a long series article on gacha. This is the third or the fourth one.
I can understand using a more broad definition of MMO due to changes in the market.
There’s almost no multiplayer in Honkai Star Rail, though, much less anything approaching what an MMO does. It has asynchronous character sharing and one-to-one chat. That’s literally all the player interaction there is in the core game. Every now and then there’s an event where you can go head-to-head in simple games like match 3.