(Not a lawyer.)

Depends on the jurisdiction—e.g. Germany[1] is known to be particularly problematic. But in this particular case, the model has been released under CC0[2], which has a fallback permissive license alongside its public domain dedication, specifically to avoid this problem. That’s why the CC0 is a thousand words long instead of a couple of sentences. Most sites hosting “public domain” works also use the CC0 or something similar.

[1] https://opensource.stackexchange.com/q/9871

[2] https://creativecommons.org/publicdomain/zero/1.0/legalcode....