it’s an alt-space launcher.
you press alt+space, a little box pops up in the centre of the screen and works the way the search box in the start menu is supposed to work.
No ads, no internet search results, just application and file search, perhaps some cheeky addition or multiplication.
As I’m sure you already know the proprietary part comes from the implementation and built in hardware support for said implementation, which AMD is not compatible with (not in any usable way at least)