I'd say Valve is a walled garden. You can't exactly take your games and put them up somewhere else after all.

I think the parent comment thought it was more strage how so many people were upset that this couldn't be submitted to said walled garden. They actively want to wall themselves further.

Fair point. I was speaking more generally.

I do like steam. It is a walled garden that can be exited whenever one chooses, and exiting is trivial but also requires deliberate action. That's good. :)