Not that Im saying to get one of these or not. Just an idea why it might be interesting to prefer to give information to one country instead of another. (if you have the choice)
Given full access to your email they can do a lot of things that would cost you your job and potentially lead to criminal charges. Given that these governments are actively performing cyber crimes in your nation of residence why wouldn't they use you (and your credentials) as a stepping stone?
The risk is low but so is the risk of your own government going after you. Neither is zero.
If you want to avoid eavesdropping, it's probably best to avoid email altogether and use something designed for that purpose (like Signal). I don't see how you would get the effect you describe by using Yandex unless you did something like only ever emailing other Yandex accounts.
