I’ve read that XMPP article before, but it doesn’t convince me.
Yes, Meta may “kill” the fediverse. That’s a risk. But either we take that risk, or we “kill” the fediverse ourselves by defederating. That’s my opinion.
EDIT: Besides, defederating just hands them more users. Wouldn’t you rather keep the users, and allow them to see Meta content? Maybe even attract some Meta users here by inviting them? The launch of a Meta competitor is what’s causing the risk to the fediverse. Federating with them is how we can mitigate that risk.