I don’t really understand the antitrust argument here. There are a literal ton of other market places to sell PC games on, such as Humble Bundle which apparently Wolfire started. You could also sell directly to consumers if you wanted without going through a marketplace at all.
This guide explains what’s going on and how to fix it. Scroll down to the section titled “Oh no but wait”
https://forum.level1techs.com/t/truenas-scale-ultimate-home-setup-incl-tailscale/186444
Here’s the corresponding video
https://youtu.be/R7BXEuKjJ0k?si=TvTONP3tbsCQeU5X