Notably, this device-linking concept of operations has proven to be a low-signature form of initial access due to the lack of centralized, technology-driven detections and defenses that can be used to monitor for account compromise via newly linked devices; when successful, there is a high risk that a compromise can go unnoticed for extended periods of time.
Well, hopefully that gets fixed soon.
I saw elsewhere that Signal has already addressed this problem and issued an update. If your app is up to date as of now, you should be good to go.
Addressed how? Do they periodically remind you that you have a linked device?