And how were those license conditions violated by downloading? Their are permissive in the first place, and violating without passing on to a third party is almost impossible.

If it’s fair use, the license doesn’t matter.

Tons of those are (as the site admins admit) models that are themselves infringing on copyright, and thus any license based on copyright ownership is invalid.

You can't enforce a license on a 3d model you in turn stole from a game.