isn't that at least partially due to the kde agreement? https://kde.org/community/whatiskde/kdefreeqtfoundation/
>> The core libraries of Qt (Essentials) and all existing LGPL-licensed Qt add-ons must continue to be available under the LGPLv3.
>> The core libraries of Qt (Essentials) and all existing LGPL-licensed Qt add-ons must continue to be available under the LGPLv3.