Why would Apple add a connector that none of their computers use?
I have a Mac. I also have a work-issued PC. I have both machines connected to the same displays, and switch between them.
DisplayPort isn't some obsolete technology here. I understand why this display doesn't have HDMI, or DVI, or VGA, or Composite, or S-Video, etc. But DisplayPort would be nice.
Type C is one of the standard interfaces for the Displayport standard, and Displayport is the standard video transport on a thunderbolt cable.
Yes, it's confusing. But it's also a good thing as you can carry lots of stuff over the same cable and connector. A USB-C type cable and connector can carry USB, Thunderbolt, DisplayPort, HDMI, even analogue audio.
Before USB-C, Thunderbolt was using mini-DisplaPort connector and cables.
Everything on the product page suggests it was only designed for Mac: https://www.apple.com/studio-display/
That it happens to work on a PC at all is, I guess, an unintentional side effect that they'd rather not even acknowledge. You can try it unsupported but it's not their problem...
They've never been good at supporting standards not invented there. Hell, ever tried to use a Magic Mouse with a PC? Everything about it feels completely off. Part of me wonders if subtle incompatibilities, where hardware works 80% of the way, is maybe even part of their deliberate strategy to introduce small headaches to the PC experience to frustrate you into switching.
(Of course OSX has its own share of frustrations too, but nothing like using PC hardware on a Mac or vice versa).
Buy the Apple monitor, be impressed, buy the Studio to go with it.