There are agreements with kde that prevent the Qt company from outright dropping free licenses: https://kde.org/community/whatiskde/kdefreeqtfoundation.php http

There are agreements with kde that prevent the Qt company from outright dropping free licenses: https://kde.org/community/whatiskde/kdefreeqtfoundation.php https://kde.org/community/whatiskde/kdefreeqtfoundation.php As far as I can tell from that the LGPLv3 seems to be required under the current terms of the agreement.