NFC PhistoI think Mobius is a bit of a special case when it comes to Private Groups mainly because they proselytize their "no PvP allowed" view of the game. In my view, they seem to hold it up as a superior version of the game, above what Open Players and even FDEV themselves consider Elite to be.
Which is fine, of course, but folks are then allowed to criticize it. Benefits of an open society and all that. In any case, the open/solo debate has never really been about play your own way but more about how one chooses to deal with adversity in the context of Elite.
I haven't seen any proselytization. What I do see is advertising in the form of signatures and forum threads, which is much the same as any other wing and private group. Not to say any individual person can't be an ass about their chosen "tribe", but that's on the individual not the group, and I see it from everything and anything. People who are being high and mighty about it are forgetting the #1 rule of the group, which is "Don't spoil someone else's game". You read it in the rules before you join, you have to type it on the application when you do join as proof you read it.