[rmrfstar]

> Your metadata just ends up getting semi-permanently logged on various machines, and there is nothing you can do about it at this time.

Sealed sender means that an eavesdropper who can introspect into RAM inside Signal's AWS infrastructure is no better off than a network eavesdropper who passively sniffs ingress/egress.

That doesn't mean they can't build a reasonably accurate metadata database covering most people--people who communicate from a limited number of mobile ips to a limited number of mobile ips.

Signal is way better than matrix, but let's not pretend it has totally solved the metadata problem.