Why should someone use a language/framework/etc they dislike just to make something in their spare time and FOSS?
Don't get me wrong, I think Electron is a problem - but I don't blame people for choosing it. Often our FOSS development aspirations are limited by time, energy and shockingly enjoyment.
I can choose to use what I want, and you can choose to not use it.
Disclaimer: I've never used Electron, but I'm shocked it's not blatantly obvious why people would choose it.