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
There is no user privacy on an open system. Just as there is no privacy when you walk down the street. If you want privacy go into your house and talk (use signal or any other privacy app).
Likewise peoples opinions are not meaningless.
The enshitification of the fediverse will come from corporate or so aligned instances that play it safe for brand. The scraping is irrelevant. Enshitification is a social issue, not a technical one.