> I was told that by default all user data is level 4, as in if you do anything without decent approval, you're insta fired. There are many stories about at least one person a month during boot camp accessing user data and getting escorted out of the building within hours.

Given the size and nature of Meta's business, I would assume they would have better systems in place. SWEs should only have access to PII with explicit consent from users/customers e.g. support tickets.

Especially someone going through boot camp. Do they have access to de-anonymized user data during training?

Shit, at my last company I had to jump through so many hoops to access user data even with consent from the customer.