As I’ve noted above, is is a violation of Bitwarden’s Trademark Policies to use the name bitwarden as part of your domain name. Refraining from doing so would alleviate most concerns with regards to the legitimate self-hosted sites. Thus, it would be a good idea if a prominent notice to this effect was presented during the installation process for self-hosted servers (or even better, if the server software automatically examined the server domain name and produced an error message if the domain name contains the word bitwarden but is not identically equal to vault.bitwarden.com).