I was curious whether main chat room can be frozen for inactivity. I even asked about this at meta.SO after I saw that this room was inactive for longer than 14 days.

But it was probably just because the script, which closed inactive rooms, is not rund that frequently, so it is not exactly after 14 days.

Considering that chat is not used too much on MO, the first outspoken badge on this site will be quite an accomplishment.

Since homotopy theory room is quite active, the stars are most likely to come from there.

actually there does not exactly seem to be a concept of a "main" chat room in se.