The public aim to make as much money as possible or at least increase valuation. The private however can be content with making enough of it. Which can really change the long term plans.
Also being public company and not increase enough valuation always runs the risk of being acquired and someone else doing it.
Speaking of which, there’s a lot of negative sentiment around these parts for Apple and Google taking 30% of their stores (“rent seeking”), but not so much around Valve for doing the same. Possibly because HN skews more towards app developers who pay fees to the former and less towards game developers.
That alone makes a huge difference and is nothing that either Apple or Google offer.
As an existing Steam user though, this is great for me! It means one less third party DRM platform I need installed.
And regarding DRM: People often forget that the use of DRM with Steam is in the hands of the Devs/Publisher. There are DRM-free games on steam. Now, how convenient it is to back up those games is another thing, but it’s often possible.
The PC remains an open platform, even MacOS to a degree (albeit apparently less so as of late...) and Valve have aggressively campaigned for it to stay that way. Competition there is possible.
I remember the debates from ~10 years ago around Microsoft's moves towards a more AppStore-like experience on Windows, where Valve really led the charge against it. The move towards SteamOS and Steam Machines seemed to be part of their reaction at the time. And it seems to pay off big-time now, not just for them but also for users, Linux users especially of course. :)
That said, negative sentiment about Steam has been a heavy subject in years past. There's a reason Epic came in swinging with super low fees.
The other part is that you have many actually useful alternative avenues to selling PC games. Yes, Steam is far and away #1, but lots of devs go direct to consumer themselves, and some use alternate stores like Epic, GOG, or Itch.
Having a mature linux support helps with that.
In the case of SteamDeck the lack of Microsoft tax also helps the price.
Unlike most companies we discuss here, Valve is not publicly held, and doesn’t seem particularly interested in being so. That, combined with their dominance of the PC gaming market, means their culture is more free to let them target things orthogonal to making money, when the whim strikes them.