About the "they asked us to view it and then fired us for it". Having worked in their RL division(I don't work at meta anymore) this story is quite weird for two reasons:

1. Meta AFAIR paid/compensated people — contractors or recruited via ads — to have them submit their data. There are strict privacy protocol and reviews in place to distinguish data use in these cases vs gen public. This is not to say the process is perfect, but if these users are gen public, I would be very shocked.

2. Hiring contractors to submit data is a more controlled environment VS recruitment of gen pub via ads to submit data, but the former has more well understood privacy disclosures than the latter. This means in practice asking contractors to wear glasses and "move around their surroundings naturally and do things" goes well with basically the privacy practice "the data your are submitting we can view and use all of it for purpose X and nothing but X". BUT this framing is with ad based recruited people — which are general users who willingly submit data — is much much harder. My suspicion is they are running ad based recruiting in general public and while those users may have signed a privacy statement it is very surprising that they did not tighten the privacy practices around the use of the data and who has access.

You seem to misunderstand the situation. These contractors were reviewing sensitive customer data, not collecting data of their own.