For what it's worth, it only uses that when adding an account initially to display the login webpage. The CEF is not used in normal operation of the app. It appears the app's GUI is created using OpenGL.
That said, I could not get the app to work with Google Hangouts or Facebook Messenger after 5 minutes of fiddling, so I gave up.
Why in the world would they do that? Can't they just launch a normal browser window or something? Downloading 500MB of chrome bloat just to display a login window seems ludicrous.
eul requires cookies for authentication. Initially it was decrypting Chrome cookies, but this was rightfully detected and flagged by antivirus software.
I'll switch to Servo in the future, it's only ~20MB.
So this isn't light or native. It uses the same Chromium codebase, but atleast twice the size of Electron apps.
https://hardbin.com/ipfs/QmNttGPf65DZ3eeuNCCWemrxyNzaHxLhpAZ...
If the rest of you are wondering where the bulk of it came from, check libcef.so (466 MB)- which is Chromium Embedded Framework.
https://en.wikipedia.org/wiki/Chromium_Embedded_Framework