Yes, but you see that beforehand if a 'game' just sells a Steam key. Many games offer direct, drm-free download. But it is important to look at what you are buying beforehand.

The most difficult thing on itch is to find out which games are good. There are so many crap games, but also a few real gems.

Yes.

I got Doki Doki Literature Club (the one place you'll find it DRM-free) along with its Fanpack from there. In addition, it's the only site I know of that sells Celeste DRM-free. I've been dealing with them for as long as I remember, and I got a lot of games from there.

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...You can only remember the last five years? That's rough, man.

Just to be on the safe side, you should probably post a list of all the ones you know about. You know, so we can all be sure to avoid them.
>.>
<.<

Umm... they have category for that... if you're really in trouble I can PM you though... XD