I recently (less than 2 months ago) did an in-depth analysis in the area of license compliance that suggests that Microsoft and many other companies that are shipping Electron apps aren't in compliance with the LGPL. (By all signs, it looks like the Electron project might not even be aware that Electron is subject to the LGPL, though they are. Even Slack, which isn't violating the license appears to be in compliance only incidentally—because they're shipping other LGPL components that they know are LGPL.)
I was set to leave the company I was at a couple weeks later (end of November), and I did, so there haven't been any developments with my investigation/findings since I departed. I haven't prepared or published a formal write-up, and I've only brought it up in a semi-public setting once. It's a pretty big deal, though. Could you raise this with Microsoft legal (not Electron/GitHub) and suggest they look into this?