It's from https://github.com/ggml-org/llama.cpp -- not associated with Meta, it's been around for years, and surely they know about it -- so I would guess either it's not a trademark violation or they don't care.

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HelloUsername an hour ago | parent [-]

> not associated with Meta, it's been around for year

This post (https://news.ycombinator.com/item?id=35100086) from march 2023 says in the title "Llama.cpp: Port of Facebook's LLaMA model in C/C++"

	▲	reverius42 33 minutes ago \| parent [-]
		By "not associated with Meta" meant, as far as I know, the authors don't work at Meta -- not that llama.cpp is unrelated to Meta's llama model.