What does that actually mean? Are they just going to set up an instance or are they going to buy out the software? What would the former actually get them? The later is open source (or so I’ve heard), so how?
One of the dangers I can see is that their instances become supernodes that carry a lot more sway over the underlying AP protocol. They could use Microsoft's old "embrace and extend" philosophy and start making special extensions that only their nodes have. Then their critical mass either forces changes to the underlying protocol or bifurcates the fediverse into "Meta-based" and "not Meta-based".
Another issue will be what data they can mine from their users as well as other instances, and what tools they will build to circumvent any protections to mine all the fedi data.
And let's not even talk about the moderation issues (or sure lack thereof) that will make the fediverse much less safe for everyone. We've already seen time and time again that Zuck & co. don't care about moderation and user safety, and actually would rather manipulate data to their own nefarious ends.
There are so many more reasons why this is a bad thing.
"They care about their company and increasing value for their stakeholders."
Capitalist corporations don't give a fuck about stakeholders - i.e. the workers who depend on income from the company for their livelihood, and the users who have integrated their product into their lives.
The company only cares about leeching money into the pockets of its shareholders - i.e. the parasitic owners who contribute nothing of value to the company or its stakeholders.