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@Conan_Kudo @mcepl @blandford I see that poison pill agreement as one of Trolltech's first experiments with not-quite-open-source.

Qt was not available under the LGPL back then: the status-quo license was the Qt Free Edition license, which you can read here: https://invent.kde.org/historical/qt1/-/blob/master/LICENSE. Far fewer people could use this license than the current Qt Open Source edition.

If Qt was the dominant toolkit for Linux desktops and was still under that license, then all most Open Source desktop apps on Linux would be dependent on the commercial license. That's the kind of lock in that led Unity to try this royalty change.