when that os claims perfect working with the same game of steam verison.

But you aren't using the steam version, you are using a cracked version..

why does it not work if the drm is stripped?

It would most likely work if you set it up correctly, but of course, you somehow expect it to run by sheer magic.. Do you think the person who cracked it/removed drm just got it working by means of magic without any effort?

The only reason why it works on windows is because someone else did the effort for you.

I get some cracked games on Linux by creating a bottle with Fit-Girl inside. However, you have to configure the bottle correctly from the start; sometimes changing the bottle settings can break things on the bottle itself. It’s not as straightforward as downloading a game from Steam, I’ll admit, but it’s not that difficult either. Obviously, you might run into some issues the first time around, but once you get the hang of it, it’s pretty simple.