What am I looking at? (Xbox Live Gold on ebay)

I've been thinking of buying an xbox live gold subscription, whether its a 14 day trial, a 1 month, or even seeing if there's still some 12 month codes out there. Thing is, when I started looking for 12 month codes on ebay, things started making my brain feel the weird.

Quite a few was prefaced with a (Brazil Region) VPN required tag, and im trying to parse this......does this mean its possible to redeem non-usa live gold region codes on a usa created xbox account so long as I have a corresponding VPN tuned to a brazil channel, because this keeps making me think if I dare try this, ill get penalized at best, banned at worst

can anyone tell me if this is a ban-able thing and I should stay away from this, period, or is this not a ban-able offense at all?