G2A
G2A
The games available are genuine. You're unsure if the keys were taken or purchased illegally. I trade in games on G2A, which I obtained from humblebundle, and I'm certain I won't play them. CSGO skins, Windows keys, etc.—you can easily fall for scams.
You have two copies of Doom ready to go. You don’t need to sell them if you keep them safe.
The game copy or my funds... I don't understand how the sales work.
You enter the game key and wait for someone to purchase it. After 14 days, you receive payment. You also incur a small charge for the selling option, which is 1% of the game price plus 0.15c. The funds arrive in your G2A wallet. Transferring them to a bank account adds an additional fee.