The fear is a practice called “Embrace, Extend, Extinguish” (or EEE). It’s been used by tech companies before: https://en.m.wikipedia.org/wiki/Embrace,_extend,_and_extinguish
It, in theory, could work like this:
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Meta embraces ActivityPub in its tech in an attempt to garner good will and make it easy for users to transition to Threads.
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Meta extends on ActivityPub by saying "oh we’re just adding a few things that make this better for our users (on our service) but we’re still supporting ActivityPub!
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Meta then extinguishes ActivityPub support, and severally hobbles AP, after they secure enough users to be happy and think AP offers no real competition anymore.
Then the enshittification process begins, by moving the focus from users to other interests (usually advertisers) at the expense of users. And eventually to the platform owners, at the expense of advertisers. Though I guess they’ll skip the middle step, being a public company?
I’m purely pulling this firmly out of my ass. While I genuinely doubt they have any intention or plans at this point, I assume being able to tell investors “oh we can pull the plug and walk away from these legacy costs at any time” is a plus in someone’s column somewhere. Of course the issue is that what is possible to save money often becomes reality.