Yes, the Steam Deck is great, and Steam is definitely one of the best games platforms there is. And Valve has done great work supporting Linux and open source development, and forcing more transparency for sellers on Steam.
But I feel like people sometimes just love valve for everything they do. GabeN is still a billionaire, buying super-yachts and stuff. Valve makes a ton of their money from gambling on loot crates in CS2 and TF2, and have not done enough (imo) to stop even more predatory third party item gambling sites. And whenever I bring stuff like that up people keep defending Valve.
We should be able to praise their great games and hardware, at the same time as criticising other parts of the company.


Most laws don’t have a problem with becoming a monopoly, the issue arises when you use your monopoly to stifle competition. Do we have any evidence of that?
Also, given how copyright works, no one sells games, only licenses. The only games that could be sold are public domain - even FOSS software is license-based. Now, if you mean that the way Steam works that you can most often have access removed from a game after you’ve purchased it, that would be a more correct statement with competitors who behave differently.
As for Gabe’s influence, he set the direction and attitude of Valve. That isn’t a day-to-day operation, but is vital to the operating principles of the company (which includes loot crates). This is no different than the CEO (or whoever) of Costco insisting those hot dogs can be bought for cheap. That is also not a major part of what he has to deal with while actively running the corporation, but everyone knows about it.
You’re right about monopolies, which is more than most Valve defenders are whenever the argument comes up. I’ve commented on this before, so I’ll just repost my thoughts:
On hurting competition, there is room to debate. Over the past couple years, Valve has been under some serious scrutiny for their [benign] monopoly and whether or not it stifles competition. Courts in the UK have certainly seen enough support for this claim to allow a £656m class-action lawsuit to go-ahead.. In the US, a new lawsuit was recently filed alleging that Microsoft and Valve have been in collusion for decades and that Steam’s no-tolerance price parity rules stifle competition and ruin any chance of smaller stores from making profit on margin.
I’m curious what USMC refers to. Most modern searches are going to direct you to the Marines, and I don’t think antitrust law would apply to them.