Probably as long as they pay the golden partner fee (some 3800 eur/year).

Iirc this software exist since the release of windows 10, or maybe shortly after, so I guess they can stay "gold partner" forever. There is probably nothing in that program attempting to prevent them to release that kind of software, and MS is not Apple...

Quite awhile; I'd imagine. It's not a new tool.

This is not a new tool. Has existed for years.

It's existed for several years now, so apparently at least several years.