Well, previous topic got closed by it's creator, probably to avoid ppl blacklisting him for his own leecher ratio, but topic itself didn't adress the issue itself. People focused on OP being a leecher and didn't discuss an idea itself, so I decided that I will put my few pennies and open a clear area for discussion.

Original idea:

I know that calling out here is bad, but i know that leachers and other stuff like that are the thing that bothers private groups the most, i dont know if people will like this but i think it would be cool to have a private group, only to officers/admins of private giveaways groups that are based in some kind of ratio just to let each other know about bad users because we can not tell from the profile if an user will turn out to be a leacher, we would have a list of every known leacher (via steam id, and proved the leeachenss of the user :P), anyway it is just an idea, but i already made the group in case people like the idea

My take on a matter:

I believe that any serious group that is seriously administrated should and will do background check on any user wanting to join. And idea proposed in OP is 1) exploitable 2) contrary to SG rules 3) won't work, cause what's breaking the rules in 1 group is fine in another.

AD 1) Anyone can create private GA group. It's not like all group admins and moderators are perfectly clean ppl by definition. Heck, every now and then we see group recruitments for groups that are obvious scams made by "group admins". Now imagine that any of hese douchebags could just go to such a group and post maybe even fake accusation that user XYZ scammed the group, while in reality maybe he just didn't agree with admin and admin is taking revenge on him?

AD 2) No calling out is no calling out. Such a group, while not on SG, is obviously made to go around the rules. It's only purpose is SG related and only reason for it's existence is to break SG rules outside of SG. For comparison - what if I were to make a group solely dedicated to leaking puzzle answers and/or GA links? Should it be ok just because I'm leaking them in steam group and not on SG itself?

AD 3) There are different kinds of SG groups, each with it's own set of rules. What will get you kicked in group A, will only let to probation in group B and will be totally fine in group C. Yet you get publicly shamed and get closed doors or even icked from groups B and C, even if your action wouldn't lead to such consequecnes in B and C.