Ask HN: Why hasn't Meta's LLaMa leak resulted in their lawyers sending C&Ds?

Years ago, it was considered best practice to not even look at the leaked Windows 2000 source code because of the liability that would open you and any future employers to. But the absence of a "cease and desist" response from their legal team, as well as the proliferation of LLaMA, derivatives, etc make it seem like they've just accepted that it was leaked and that's that. What am I missing?