Generally speaking, you don't lose access to your Steam library unless you defraud them, e.g. by charging back purchases. I don't buy that the Russian guy got banned for spamming. The only evidence that that was the ban reason is his own words. Considering that this story seems to have only been picked up by sites like "oneangrygamer", "riseupgamer", and the Daily Stormer, I'd lay money he's not being honest.