Some background: Lots of stories in the media in Sweden recently about how murders are now ordered via chat apps. Today in fact, there was one about a Snapchat murder. https://www.aftonbladet.se/nyheter/a/8qL3A1/uppgifter-missta...
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I'd argue it's not giving us any certainty. They could've moved away to escape. They could've moved away to a nice FSB-sponsored location while making good publicity. Ideally the tech should be good enough for this issue to not matter.
People literally would just disappear day to day. I've had several instances where I only found out a colleague had been fired because I tried to write them on Slack only to find that their account had been deactivated
Personally I felt constantly worried working in such an environment and I don't want to work for another US company again if I can help it
There are of course bad cases in the EU, but in my experience it's way less common than in the US