Valve could branch into Apple's areas, but they don't seem particularly interested in doing so yet.
EDIT: rather, Apple cares a lot about phone gaming, but that's an area that Valve has shown few signs of moving in on.
It doesn't have to be. Proton runs fine on Android.
I’d love someone to actually compete with Apple at the specific kind of thing they do, but I don’t see it in the cards for Valve. Too much distance, with things they don’t have to solve to hit other (apparent) targets of theirs.
As for Microsoft, what is Valve threatening? Home no-business-use-case (mostly gaming and maybe light web browsing) PC owners, and I suppose x-box? The former has got to be negligible at this point, and the latter… I guess maybe, yeah, they could threaten that.
[edit] to soften this somewhat, I do love what Valve is doing and their micro-PC thing they’re releasing next year is likely going to be an instant purchase for me, provided supply issues don’t drive the price insanely high or otherwise mess with the release. I happen to be in the exact niche of people who are thrilled to have a good low-tinkering option that lets me ditch my last Windows machine, so this stuff’s my jam.
With the broader job market being not-great, and everyone trying some sort of side hustle with the aims of making it big, it's definitely the bubble I'm in, but the "home" case has a lot of Google free office suite business looking usage, and even if there isn't a side hustle, maybe my friends are super weird but they use Google sheets to organize things even for non-business life things when things get complicated. Eg planning a wedding. That's Google and not Valve, but if customers get Steamboxes to access that vs Windows laptops (or Chromebooks), it looks like a threat to Microsoft to me. (But it's been the year for Linux on the desktop for decades now, so I'm not holding my breath.)
The third party Mac software is often better, but not always.
And yet, Apple controls the world's largest gaming economy (~$78B in 2025), dwarfing Sony's (~$31B) and Microsoft's (~$24B).
Is Apple invested in anything at all right now? Seems like they are only ever iterating over the same products in their idiotically domain separated legacy zoo of devices. Lately even fucking that up with UI "innovation" literally everyone hates. I mean, who's talking about Apple VR anymore? Apple AI is a meme. What are they cooking with all that cash?
I don't think Valve has to even consider Apple.
The kind of gacha games that dominate the in-app sales charts, sure. Actual gaming, they don't care about or even understand.
Apple cares about gaming on their iDevices and related Apple store profits, macOS not so much.
From what I see, Microsoft is the only one they have been gunning for, and even that behemoth is looking to get out of the way. Their Xbox platform has practically imploded, and they have specifically designed Windows 11 to be less of a PC operating system and more of an ads platform and a cross-selling channel for their AI/cloud offerings indicating that they've lost interest in the consumer market as a whole.