[mapcars]

There is some information that the threats were sent by a guy who lost ton of money on recently crashed biggest Russian bitcoin exchange.

[Kinrany]

Do you have a source?

[mapcars]

yep, it's in Russian though: https://news.mail.ru/society/40378912/

[Kinrany]

Primary source: https://www.bbc.com/russian/features-50956160 (also in Russian)

It seems all evidence is based on the emails sent by the author of the bomb threats. I don't think it works as evidence against this being an inside job.