Meta could probably mitigate at least some fears about this if they did any planning or discussions out in the open.
I get they want to have a massive “reveal event” or something, but come on…
It’s entirely possible (but perhaps unlikely) that this is a passion project by some engineers and Facebook is just sponsoring them “hands off”.
“We here at Meta take people’s privacy very seriously and are committed to protecting our users. Unfortunately at this time we can’t discuss what measures we’ve put in place.”