[Vinnl]

Only the messages are encrypted, but there's a ton of metadata that isn't, e.g. who you talk to, when, where you are when you do so, ...

[akdev1l]

But in the client is the only time their code touches the actual unencrypted message data.

Also a lot of the data you mentioned will also not be available if you don’t use their client, eg: if you use Signal client then Facebook won’t get your location all as that’s not part of regular text message