Proton is the directX to Vulkan translator

But WINE does exactly that, it translates different Windows APIs. I've been using it to play games (including Steam games) way before Proton was released. It has existed for 30 years now. Proton came 25 years later and according to Wikipedia:

Proton is developed by Valve in cooperation with developers from CodeWeavers.[2] It is a collection of software and libraries combined with a patched version of Wine to improve performance and compatibility with Windows games. Proton is designed for integration into the Steam client as "Steam Play".[3] It is officially distributed through the client, although third party forks can be manually installed.

You can see for yourself that it uses WINE and other software that WINE also uses, like DXVK: https://github.com/ValveSoftware/Proton

Not to mention that Valve managed to solve the problems around anti-cheats and all of this works with minimal tweaking.

If this is truly their achievement, then it is impressive.

Nice of them, to make a revolution and then just let the people actually have it, don’t you think?

If there is a revolution, then it seems that it's mostly an achievement of WINE, DXVK and other developers. It is great that Valve contributes to Free Software, though. But that doesn't change they fact that they also make proprietary software, which is unethical and they are doing it to attract people to their proprietary platform. WINE is licensed under a Copyleft LGPL license, so it's also possible that Valve had no other choice in this case. Since last I checked even SteamOS was proprietary, there are good reasons to doubt their intentions.

Also DRMs are already not the shittiest malware big companies trying to install on your machine, it would be anti-cheat. Why noone talks obout them? There are methods to detect cheaters without installing a rootkit spyware on all the end-users PCs.

I talk about it, but most people don't care about stuff like that at all.

Lol. Sorry, but the games and DRM are not why. The most important reason to it is that we’re losing proprietary software’s technologies. Technologies that might help advace our modern day of living. Also because what they’re restricting is basically a knoledge, and knowledge shoud be free, not because your poor ass can’t own their games.

My argument was that people deserve to be able to control their computers and to do that, they need to be able to control the software. Your reason is very important too. You can watch Richard Stallman's talk for more: https://youtu.be/Ag1AKIl_2GM

And Proton is the example that Valve contributes to FOSS community, unlike literally every other major game company, even CDPR.

That is true.

Thats not even all of it to why i stand on my point, Steam prices are also the most humane, especially if we mention all this bunch of sales steam is famous for. They were there from the beginning, even though they could’ve done something similar to PSN in terms of pricing policy, given that steam was and still kinda is de-facto monopoly, since other game stores on pc have only the fractions of steam’s profits at the most.

What you are saying is true, but before Steam became popular, it was possible to buy used games on physical media for cheap. Now even physical copies of PC games have Valve's DRM, so I blame Valve for destroying the used games market on PC (on consoles it still exists).