Can be unclear to users that a room has been sucessfully protected from the `rooms add` command.

[Gnuxie]

Context: https://matrix.to/#/%21IaWNErZAgQUhGqJXjX%3Amatrix.org/%24I1kOW6PVEJ3kcDcWkvUU-dv4j31JnVg3gXemmflq_E8?via=matrix.org&via=envs.net&via=ubuntu.com

Responding with a reply like "<rom pill> is now protected" might help.