Group Giveaways?

Sometimes

Some will advertise on these forums when they finish kicking members who have failed in the given rules, while others are joined through other methods, like being invited only by the choice of the admin, or getting an invite from another site.

I myself run a private giveaway group, where I'll give away a bunch of games, and a few members will create their own, but entry to it is exclusive to members of another site. Doesn't matter how awesome someone is here, they won't get in if I don't know them there, assuming they even use the site.