alt Hacker NewsThere is absolutely nothing harmful about permissive licenses. Let's say that Wine was under the MIT license, and Valve started publishing a proprietary fork. The original is still there! Nobody is harmed by some proprietary fork existing, because nothing was taken away from them.
A decade or two ago Wine was on permissive license (MIT I think). When proprietary forks started appearing, Codewavers (which employs all the major Wine contributors) relicensed it as GPL.