There are no good corporations... well, not any more. Some of them actually used to care about making good products. Now, no, none of them care about that.

Corporations are corporations. They are groups of people legally mandated to make money for their shareholders. They're not individuals.

Exactly.

But I'm also very confident that nobody looked at the rounding error that is the fediverse userbase, disproportionally made up of FOSS true believers and fringe infosec nerds and went "we need to plot their demise". That's not a thing that groups of people concerned with building userbases in the billions talk about.

Not saying that that is the true nature of the plan, but that there are numerous aspects (as you noted) by which this can be seen as a good thing by Meta (as in, it gives a peek into their playground) to do... whatever... good or bad, doesn't matter.