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The use of VPN is only forbidden by Steam, IF you use it buy things from the Store
That's not true.
From the TOS:
"You agree that you will not use IP proxying or other methods to disguise the place of your residence, whether to circumvent geographical restrictions on game content, to purchase at pricing not applicable to your geography, or for any other purpose. If you do this, we may terminate your access to your Account."
Yes, but i have yet to see/read from someone that got problems for just activating a game.
They are keys from Amazon.com.
You have to give the TF2 key(s) first, except you have >100 rep.
For Inversion you need a US VPN ONLY for activation. After that you can play it without one!
I tested it myself with the trial of FlyVPN
The use of VPN is only forbidden by Steam, IF you use it buy things from the Store. Not for activating games!!
If you have any question, feel free to ask here or add me on Steam!