License agreements/terms of use don't require signature usually. Consent is implied by downloading. That's also the case when you eg; clone a repo, download a file, etc.

I'm anti DRM + restrictions as much as the next guy but just trying to save folks from a bad time if meta comes knocking after seeing corporate IPs downloading the weights.

This might be a bit of an assumption, but it seems likely Meta is willing to lose more on lawyers than you'd be willing to ever spend.