Haven't seen the video, but my understanding is that Estonia treats it's citizens' ID's as public/private key pairs. So once you use your private key to vote, the government knows that key can't vote again (or perhaps they see a "second" vote as changing your original vote).
Oh no... Those emails... I can smell the desperation from here. You can maybe get away with one customer-relations-type email "hey, sorry to hear you didn't like the experience, let me know if there's anything we can do to improve!" And then you just gotta leave it alone. You can't make friends with everyone, and you certainly can't argue your way into being friends with everyone.
It's an ecosystem that's hard to break away from because, despite all the bloat and clunk, developing on Windows is a lot nicer than developing on other operating systems. Even now I find it so much easier to write C# in Visual Studio than C++ anywhere, even Visual Studio. I have so much less to worry about when MSDocs are organized, versioned, readable, and provide examples. Then I look at cmake docs...
I'm biased because I'm working on a C++ app right now and not having a good time lol
At the end of the day, when the sun sets on their careers, when the last of any paltry consequences cease to apply, conservatives would still rather salt the earth to spite their peers than water a tomato plant to help their rivals.
They don't know how to make friends. They only know how to ruin. Today they happen to be ruining each other, but don't forget they ruined the rest of us first.