Dropsitenews published a list of websites Facebook uses to train its AI on. Multiple Lemmy instances are on the list as noticed by user BlueAEther
Hexbear is on there too. Also Facebook is very interested in people uploading their massive dongs to lemmynsfw.
Full article here.
Link to the full leaked list download: Meta leaked list pdf
Scrapers ignore it
Thieves can smash a window to get into my house but I still lock my doors.
This is more like being there when they come to steal and you ask them to ignore some rooms please.