The Microsoft Store has been trying to find the right policy for that. For a brief couple of months policy 10.8.7 accidentally forbid charging for any open sour

The Microsoft Store has been trying to find the right policy for that. For a brief couple of months policy 10.8.7 accidentally forbid charging for any open source, in the hopes to counteract some of the people profiting from open source that were not official maintainers, but that policy change was rolled back because there are several legitimate open source projects that the official maintainers use store sales as a useful donation stream. Meanwhile there is a bullet point in policy 10.1.1 that is almost directly what you are asking for, it is currently: "Your product must not claim to be from a company, government body, or other entity if you do not have permission to make that representation." I certainly believe that "other entity" covers most open source organizations that aren't specifically companies already (or wrapped in a Foundation/Conservancy that acts as a "corporate parent"). The problem can't be solved with just policies though, the real key is enforcement: the fake listings from non-maintainers of open source need to be reported to be enforced. That likely means review time by staff. Tweets like the one linked here today can be calls to arms to submit user reports to help Microsoft know there's a possible problem here. Hopefully policies get enforced (eventually).