Alternatively they have to go bankrupt, then the agreement with KDE Kicks in and it becomes BSD https://kde.org/community/whatiskde/kdefreeqtfoundation/ (but in that case one has to ensure somebody continues working on it ... no idea if KDAB and KDE have enough manpowwer ...)
I am not saying I like Electron better. I prefer Qt, even though I don't consider it to be native either. But Qt would not have died had they relicenced earlier. It's evident they will have to do it eventually. Why wait until there's no more lunch to be eaten?
As an outsider it seems like the "Desktop" side seems to be a marketing vehicle, but not their bet for business (see also push for QML over QWidgets - less integration with desktop and less "native" looks, but working on cheaper hardware)
It's not 100% MIT. Chromium's Blink renderer has LGPLv2.1 code going back to the KDE KHTML days, such as some of the code for the DOM:
https://github.com/chromium/chromium/blob/master/third_party...
Very rough way of going about it, but searching for files with copyright headers crediting KDE shows 832 files
https://github.com/chromium/chromium/search?l=C%2B%2B&q=kde....