Came here to post this. Extra important since they don't collect analytics!
FYI the debug logs are a very curious part of all this. Signal streams them usually to a domain they keep their ownership of somewhat hidden. The domain is: debuglogs.org and the endpoint is just api.debuglogs.org.
It appears to ultimately just front for AWS S3 backend so a very common architectural pattern.
I'm not sure I understood what the curious part about the debug logs was.