is there an advantage in using bitcoin for steam?
Not if you have a credit card. For ex. are prices globally equal in bitcoin?
BTC exchange rate is calculated by averaging BTC price @ major exchanges, will be displayed @ check out. So I guess yeah.
even in that case. i give no data to steam (cc fraud) and it is easier and faster to pay in bitcoin. i know it because i do it
As long as you mine your own coin, I suppose. If you have to buy BTC, I don't think so.
Exchange: must provide personal info, pay fees, wasted time (hassle of funding, which itself may involve additional fees).
Localbitcoin: Hefty premium over spot, safety risk, time.
Bitcoin vending machines ("ATM"): Hefty premium over spot, time.
Re. CC fraud: Unlike BTC tx, you get your money back.
i have to reveal my ID to the exchange but not to Steam or any of the 100 porns sites which i (maybe) visit
and the good thing is: Bitcoin price went up and i get 40% more for my money now.