Why is that a gap worth filling? There is no benefit to users as long as its free of a EULA they don’t have to care either way. For those wanting to produce open source software based on same they already have all the rights they could need. The only party clamoring for permissively licensed software are companies intending to close off the source and sell other people’s work.
I understand why they would want to do that I don’t understand why anyone would feel the need to work for free for something someone else closes off.