Steam itselt dont sell keys to end users at all and ability to sell gifts is really limited. Though game developers / publishers can generate any reasonable amo

Steam itselt dont sell keys to end users at all and ability to sell gifts is really limited. Though game developers / publishers can generate any reasonable amount of Steam keys for free and sell them outside of Steam where Steam itself get absolutely nothing. This is where most of fraud take place and game developers lose a lot of money on it.