KDE is a community of developers that makes various software products, including Krita - that's why there's a KDE account involved here, since KDE makes Krita :

KDE is a community of developers that makes various software products, including Krita - that's why there's a KDE account involved here, since KDE makes Krita :-) Many of those software projects available even for commercial systems like Windows and Mac OS, and of course the various free software environments. Those users are all equally important, so there's no conflict there.