I don't know the full details but Alpaca is from Stanford and only based on the LLamA (not a derivative work afaik). That said :

Also Meta's licensing here https://github.com/facebookresearch/llama/blob/main/LICENSE

Can't be sure what that license actually reffers to, the language model or just the tooling in the Git Repo.

I agree its a minefield, but with Meta I would eer on the side of caution.