Do they? I've read a lot of stories of G2A doing nothing after a scam was reported (even with G2A shield purchased).
but if you get scammed in BST thread all that will happen is that if you report it the scammer will get banned and his listing removed.
is NeoGAF going to reimburse you the money you lost? No.
G2A is simply BST on a larger scale, but some people seem fine with one but say the other is super shady. seems like cognitive dissonance to me
note I never used G2A so I'm not sure how it exactly works