You only get one Steam Key (I already have one), no DRM-free version, is that correct?

The game is very heavily integrated with steam, a DRM free version would give cheaters a total way of dodging a ban since they can just create a new account. Cheaters are our main pain in the butt atm.

What's the point of putting it on itch.io if you're just gonna sell the DRM copy anyway?

By buying directly from the dev such as in this case, you give Valve 0% of the money and the developer 100% of the money with presumably itch getting a small cut too. So buy here if you want to support the dev and itch but not Valve.

They sold us this DRM-Free on Humble a while back, then killed the copy we bought, ended up with a Steam key instead.
Their "cheaters" aren't as big a deal as the whole system failing and exposing users to potential threats.
They *really* need to bring back the DRM-Free version I bought, and just remove server access, let us play direct connect multiplayer or local games and not be subject to buggy insecure servers and Steam account requirements.

The real reason theres nno drm free version is so they can sell you tons of stupidly overpriced dlc.