Qt Company will turn all releases commercial only for the next 12 months

That's the minimum they have to do under the contract between KDE and Qt Company. Qt core/essentials must be released under open source license after 12 months. https://kde.org/community/whatiskde/Software_License_Agreeme...

If you look at what Qt is doing, their business is moving away from the KDE type uses. They get their money from embedded and appliances. Qt on MCU's moves Qt more into this direction.

The official KDAB position:

https://mail.kde.org/pipermail/kde-community/2020q2/006101.h...