The link in another response to me has a link to a clarification video from Musk. I didn't watch it, as the text was adequate. It looks like no licensing is required and that they've been legally dumped into the public domain in a binding fashion - maybe. That's not actually ever been ruled on in a court, from what I can find via Google.

That post suggests no company legal team would allow it. The article thinks Apple might use it, as an example of a user.

I am no expert, so I'll defer to others.