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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
They could just spin up a no-name instance that isn't associated with them to get it through federation, though. It still doesn't make sense to scrape.
They'd have to host it from somewhere not related to Meta in any way, otherwise someone on the fediverse would find that link and spread the word, and it would be blocked the exact same way. It only takes one person making that connection, Meta knows they're hated.
Mega corps do that all the time. They have shell corporations for the exact purpose of obfuscating their future intentions.
They could stick it in Azure or AWS or something.
Or they could just use their existing scrapers and try to brute force it. Meta isn't exactly known for being sneaky.