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Re:Moving from Native Apps to Progressive Web Apps by jaysoncena on Sunday November 13, 2016 @08:33AM (#12943225)
He's probably referring to QT5. If you're a for-profit business and using QT, most likely your software is closed-sourced which requires a commercial license.

I've worked with a team who develops a windows app which still uses QT4. They cannot migrate to QT5 since it requires a commercial license.

Re:Moving from Native Apps to Progressive Web Apps by blub on Sunday November 13, 2016 @08:38AM (#12943246)
Open source doesn't always mean that one can do whatever they want with it, nor does it mean gratis.

Still, LGPL libraries can be used for commercial software, this is a rather common use case.

Re:Moving from Native Apps to Progressive Web Apps by SkyMarshal on Monday November 14, 2016 @03:16PM (#12952914)
Yes, we looked at Qt 1.5yrs ago, and we were a for-profit startup creating an MIT-licensed open source desktop software that we needed to add a UI to, for which we were considering Qt5 for specific features. It was a weird, edge case mix.