There 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.
There 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.