Make a pledge to only promote FOSS

matrix.to seems to be quite important for the Matrix system right now as it is a central place containing various links to softwares.

Currently, it looks like the only clients that are recommended right now are FOSS. Not a single software appears to be proprietary. Which is great! FOSS for the win! :D

But I'm afraid that once Matrix gets larger, proprietary softwares will eventually appear and try to gain traction and dominate the Internet, thus threatening the vision of a free and open communication system. The point of Matrix goes right of the window if the biggest and most important clients are all proprietary.

I therefore kindly request for the matrix.to project to make a pledge:

That right now and in future, no proprietary Matrix client will ever be recommended or linked to via matrix.to.

This pledge would imply the removal of clients if a proprietary client was added by accident or if one client turns evil (becomes proprietary somehow).

Review the current client links on matrix.to and the existing discussion in this issue before deciding whether a project-wide pledge is appropriate. Done would require an explicit policy commitment and a clear approach for removing or avoiding proprietary clients, but the issue does not identify files or tests.