For Monado on Windows iirc the current state is that it works but not with real hardware (which is usually well supported officially anyway) due to lack of drivers. Now if it becomes the only platform to keep supporting WMR the developer incentive is definitely there.
I love their approach to Hardware and Linux but have we collectively forgotten that Valve had a huge part in pushing loot boxes and underage gambling? Far from being the least evil company, but still a net win for consumers and I appreciate that they exist.