While in general I agree with your security concerns, here the links are from very trusted sources (Mozilla Internet Ecosystem and Mozilla's innovation group) and the user is well known (present on X too with a large following).

Re: "simplicity", sure for you and I it's simple to compile llama.cpp, but it's like asking a regular user to compile their applications themselves. It's not that simple for them, and should not be required if we want to make AI and OSS AI in particular more mainstream.