Developers stop using Qt for good technical reasons in projects that don't require the unique features of Qt. Qt's strength is being multiplatform. It works in embedded and realtime operating systems. It's not even useful for scrape by contract workers who do better with free web framework/UI stuff. Your TV, car, Television, have Qt in them. Its in medical devices and industry automation.
Qt may lose market share for Adobe PhoneGap, React Native, Flutter, Xamarin but that's because those target restrictive subset of what Qt is good for. Again, it's for good technical reasons. Nothing to do with licenses or Qt being evil company.