Krita can also be bought on the windows store. The money is used to pay devs full time to work on opensource. something you also benefit from.
opensource projects, which wish to pay devs for full time work, need to finance that work somehow.
for some it is donations. others have paid versions. others have support contracts.
I don’t think there’s any opposition, just lack of time and developer energy among many other higher priorities (like getting GIMP 3.0 released in a few months). If a knowledgable person came in and was able to help with the process, it would probably happen a lot faster.