The Qt licencing situation is way more complicated than that. Parts of it are available under LGPL, parts are available under GPL, and some parts are only available under a commercial license which is a minimum of $5500/dev/year.
But all of the extras parts that are not under the LGPL are things that GTK (nor Electron) doesn't even have, so I would argue it's still an unfair comparison.
There's a big chart here:
https://doc.qt.io/qt-5/qtmodules.html#gpl-licensed-addons