"The Qt Company has followed up on its plan to make long-term support releases commercial-only by closing the source for 5.15 today, earning protests from open-source contributors" https://www.theregister.com/2021/01/05/qt_lts_goes_commercial_only/ "That's some brilliant timing, given that no actual qt 6 release even exists yet (yeah, 6.0 is a joke given that you intend to break binary compat in 6.1)," said one developer. Another said: "Qt6 has half of the modules required by my project not yet available, so upgrading is not possible. On the other hand, 5.15 LTS is closed for the open source users – this is quite a heavy restriction for me since my project is non-profit and open source. Buying a commercial license is not an option." Open-source contributor Thiago Macieira, an Intel software architect, said of the decision: "That means I will not be participating in the development of those fixes, commenting on what's appropriate or not, reviewing backports, or bug reports." "Tend to agree," said Konstantin Ritt, another developer.