As an aside, I’m very much convinced that Signal’s primary objective is to gather phone numbers in order to facilitate the US government tracing social networks of people who are already of interest Their main focus isn’t on what these people are discussing, they want to know who is talking to whom first and foremost. Signal’s subpar user experience is a feature from this perspective. Due to its inconvenience for the average person, those with a strong need or desire to communicate sensitive information are more likely to utilize it.
I’m pretty sure they like having as much data as they can. The policy seems to be is to trove everything and to figure out what to do with it later.