Because of X and Meta fucking things up once again, people are talking about abandoning social media, because there are no corporate free alternatives. Right.
I don't think having Twitter or Meta staff should automatically be a problem. It depends a lot on their role, whether they're still there and so on. I doubt most Meta employees agree with that the bosses are doing, and probably have no say on it. They do bring in valuable experience on how to develop a social network, however.
I think I remember some of this in response to the Mastodon foundation accepting Meta and Twitter staff to the board? It's a concern I kind of understand, given the outsized influence Mastodon has on the Fediverse, though I'm not sure how things panned out with that.