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Author here. Can confirm, I asked my boss (small German company with 7 employees) about getting Qt commercial license, because the Qt3d engine is still unusable slow and QtQuick3d looked like a nice alternative. Our product isn't even out yet, and we would have to pay 100k+ without having earned a single penny so far. We now switched to an embedded WebView Godot version for our 3d needs inside our qml desktop app.

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Probably the better solution. It is an understatement how hard it is to get out of the commercial licence. If you would find out later that it isn't for you (or the Qt Company raises their prices again, like what happened from v5 to v6).

You even require written permission from Qt to upgrade from LGPL to the Commercial License[0]. Because if you started programming without paying them their fees you probably owe them even more money according to them...

[0] https://www.qt.io/faq/tag/qt-commercial-licensing (If I have started development of a project using the open source version (LGPL), can I later purchase a commercial version of Qt and move my code under that license?)

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