If you are limited to signal, its a problem users like https://discuss.tchncs.de/comment/7643631 might not have.
Signal ties you into google or apple and mobile operator so I wonder what its benefits are beyond stopping Facebook monetising peoples data.
https://codeberg.org/meissa/forgejo/src/branch/forgejo-federated-star/docs/unsure-where-to-put/blog.md#2024-02-considerations-on-mapping-and-architectural-decisions