Suspected scam group on Steam

I haven't seen this being mentioned anywhere else on SG, so I'm taking the initiative to warn everyone about this.
I've been in a group called FSGGA and I've come to conclude that the giveaways they do on a regular basis are fake and an attempt to lure users into giving away their items for nothing in return. I'm basing this on a few observations I've made. They have another group they're using to advertise their giveaways - TRAGBros.
There have been reports of it being a scam group, that it's hosting fake giveaways for publicity, promising private giveaways with higher chances of winning for "donations" and taking the victims' items. Very recently, they started doing "$100 Steam card giveaways". I decided to use an auto-refresh extension on my browser to make sure I was the first one to get a code, but the only plausible truth I can find is that they're posting duplicate codes. Rarely does anyone ever claim that they've taken the codes, and those who do are in fact their accomplices/friends. For the record, the only person that I saw claiming their "code" is in fact friends with the group's admin, and they even have a giveaway group of their own, in which they used the exact same tactic.
On the latest giveaway, FSGGA's admin wrote "friend me for a private giveaway with higher chances of winning" - nevermind the fact that there were only around 10 people active for this giveaway. I believe that's how they get their victims.
There's also some evidence of the scamming they did on a previous profile, here and here. Notice they were already mentioning that group there (March 2015). I tend to believe they changed the name of the group, but the url stayed the same. The profile in question is here. They're also trade banned and VAC banned, so it makes sense they switched to another account (hence why that one is inactive). It seems there haven't been a lot of threads on this as of recently.
I've also read on a brazilian forum that a user friended them and they promised him a $100 wallet code in exchange of very cheap items he had in his inventory - see here.
I think it's very likely that they're scammers with a massive following and they need to be stopped; only through spreading the message will this have a chance of ending.

This is their current main account and, as you can see, they have multiple VAC bans and a trade ban.
Hopefully this will be able to help someone.