This is a terrific post for those of us, like myself, who have used Hypothes.is but who aren’t as familiar with the RSS-related features.  I have a related question that may be better asked elsewhere but here goes:  Are you using a Microsub server to read these RSS/Atom streams from Hypothes.is?  If so, which one?  The Microsub server I use, Aperture, does not seem to recognize the RSS/Atom streams.