The MIT license only covers what Electron adds to Blink (the rendering engine, which is under LGPL). It does not replace all the licenses of the various components used as part of Electron for which you still have to comply.
That is the exact same license than Qt, you do not need to expose your IP when using it (Tesla used LGPL Qt for their car dashboards and you don't see that IP floating around on the internet)
https://github.com/electron/electron/blob/main/LICENSE
So everyone can use it without the need to expose his IP.