I don't have a horse in this race, but that website just says "username you passed in query string is a scammer as of some recent date" and provides no sources or proof. It's libel as a service?
Though it does sound like Steam would still remove your access if you actually did inherent the account (even if OOP is lying about that). I think that’s a pretty shitty policy, especially since it’s not like more than one person can use the account simultaneously.
> "Your Account, including any information pertaining to it (e.g.: contact information, billing information, Account history and Subscriptions, etc.), is strictly personal. You may therefore not sell or charge others for the right to use your Account, or otherwise transfer your Account, nor may you sell, charge others for the right to use, or transfer any Subscriptions other than if and as expressly permitted by this Agreement (including any Subscription Terms or Rules of Use) or as otherwise specifically permitted by Valve."
> "In the simplest terms, this means that without express permission from Valve, you can't just give your Steam account to another person. Even if you were to write it into your will that you wanted this to happen, without that permission, it wouldn't hold up upon your death. Earlier this week, I spoke to a lawyer who specialises in the video game industry to confirm that this is, in fact, the case."
Completely not legal. Maybe contract law is bloated enough in the US to give valve that power, I'm pretty sure it isn't in the EU. Valve can't decide how ownership works, not in all jurisdictions.
Worth mentioning that you don't own the games, you buy non-transferable licenses to play the games. Therefore I think it's perfectly (and unfortunately) legal.
It looks like any one mod from any of dozens of subreddits can put someone on that list for any unspecified reason, and there's no checks and balances, appeals, or other recourse. For all we know, a mod of r/lolboosting could have put him on the list because he wrote in some other unrelated subreddit that he prefers DOTA.
Of course, we all know that Reddit mods are known for their fair and impartial behavior.