This morning an article was published showing the links between child labor in mines to primarily Tesla but also similar; investigative journalism by Aftonbladet, one of 2 major evening newspapers in Sweden, about as mainstream as it gets.

As an apparent response, "free speech absolutist" Elon Musk, owner of both Tesla and of rebranded Twitter... flagged links to the article as "may be unsafe".

I won't translate whole article (https://special.aftonbladet.se/story/jleydo and https://www.aftonbladet.se/nyheter/a/jlWAOA/sa-kopplas-tesla-till-barngruvorna-vi-foljer-sparet in Swedish) but the main gist is 11000 children mine mica (https://en.wikipedia.org/wiki/Mica) on Madagascar, very large island at SE of Africa, then it is bought by Glory Mica, shipped to China and from there on to the rest of the world where the most of the found transaction traces ended up with "Tesla Inc." as final recipient, but also some others like BMW of Germany and Volvo Cars (majority owned by Chinese "Geely Holding Group").

Volvo Cars responded to request for comments e-mail with a very long message claiming to be member of a "Responsible Mica Initiative" and they get mica from that company but not Madagascar but don't have tracing but working on it and blah, blah.
BMW gave a shorter version of same claim and not really an answer.
Tesla took many days to reply with only links to its website for claimed policies.