The fact that the platform makes the community isn’t necessarily something I’d consider at first, and I don’t think Elon considered it either.

Small correction, it’s actually the community that makes the platform. The community exists regardless of platform, the platform is there to help the community connect. The platform can help make new communities by facilitating connections but the platform needs communities to exist. People will form communities tailored to their interests without the internet all day, they’ve done it for millenia. If the platform makes it difficult for communities to connect, then the community will just go elsewhere.