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Nvidia has been in talks to acquire Hugging Face for more than $13 billion
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
From what I've seen, the sitse that charge for STLs are priced based on the sculptor, unless you mean something else
Some do, others just charge for everything or charge for something that's released for free elsewhere.. Cults3d and Yeggi are bad for that from recent memory.