Does this change anything?
https://lists.qt-project.org/pipermail/development/2025-April/046313.html
Re: I believe part of the problem with QT>5.6 was that the QT Wayland functionality was licensed separately.
Looks like from a packaging standpoint at least that it is being rolled back into QT core.
AFAICS the licensing of the Qt Wayland QPA plugin is unchanged, it is simply moved into the Qt Base source tree, technically.
Actually, I am convinced that the Qt company chooses their licensing (i.e. available licenses, specifically Qt components which are dual licensed (i.e. at each direct licensee’s choice) either *GPL3 or proprietary) for the various Qt components very skilled, both legally and by the practical effects the specific licensing for a Qt component achieves. As their success (revenue, company growth etc.) proves them right, I do not believe they have any reason to deviate from their established licensing schemes.
thanks for the detail, much appreciated. 
never heard much of qt company. they do well ?
Q4 net sales grew 15.5% to €68.5 million