What sort of ethics (or lack thereof) are we allowed to discuss on this site?
APUG is a forum for the discussion of traditional photography. Ethical questions related to photography are on topic for the forum--censorship, copyright, image manipulation, model releases, photographing strangers, street photography, paparazzi, relationships with clients, things like that.
Discussions of the moderation policies of other forums are off topic, for the reasons JD Callow stated.
Another reason that we've decided not to host that sort of discussion here is that sometimes disgruntled or banned members from other forums wash up on the shores of APUG
en masse--not that this is the case in this particular instance--and then they open endless threads about all the problems with the other forum. They come to APUG to get away from those problems, but instead of getting away from them, they bring them along with them, and then the rest of us have to deal with the bad feelings coming from some other community.
If you don't like something about APUG, then post it in the Feedback forum or PM Sean or the moderators. If you don't like something about some other forum, then post it on that forum. If you're banned from that forum, or if your complaints are censored, then start a blog and say what you want there.