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Training Generative AI Models on Copyrighted Works Is Fair Use - Change My Mind
(mastodon.lawprofs.org)
This is a most excellent place for technology news and articles.
The license is related to access.
Basically it's gated and not publicly available, and the only way to open the gate is to say "I promise not to do anything outside what you are limiting me to do."
A second person that gets access without agreeing to that can use the weights however they want (what copyright would relate to), but the person who gave them access to the weights would have been in breach of their agreement.
So separate things with different scopes.