Forcing them to use public standards and forbid them to develop their own? You can't possibly believe that, you're literally stifling innovation. A much better approach would be to force them to make their standards public.
They can do whatever they want in addition to that, but table stakes or you aren't installable in a new build home.
However many monitors only implement part of the overall FreeSync spec. So when you buy a monitor with FreeSync, it might be fine from 1-60 fps, but 61-144 fps might have issues.
So, how do you enforce that all "basics" are met? Consider the complexity of new technologies like Bluetooth 5 or Wifi 6 - even getting all the basics is a huge amount of work.