Former Facebook wanker, who worked in research.

1) we were always told and legal always pushed back hard on anything face detecting.(ie haar cascade "this is a face" let alone actual this is dave/sally)

2) the FTC would audit us to make sure we weren't doing that kind of stuff

3) all of the research prototypes had inbuilt/inline face removers up until 2024(I left after that so I don't know when/if that changed)

3.1) One of the very first things I worked on was face removal, it was a central core of the entire fucking project. Like if we didn;t have any of those constraints we'd have been 2 years ahead.

4) Stella is the name for v1 rayban stories, so its very odd that they get the update when they've not had any new features since for a long time(unless I am mistaken).