Microsoft, too, will pull projects, or just completely rewrite them and make them incompatible.
Applications using .NET Framework with WinForms are not just a dependency update and recompile away from being ported to .NET 6. WinForms got a whole new API and porting complex UI effectively boils down to a rewrite. At least if you can. Microsoft doesn't support third-party controls in the WinForms designer of Visual Studio for .NET 5+, so have fun trying out positions and compiling over and over.