At 129 RUB(~1.50 EUR)/month, it isn't free but it's drastically cheaper than O365 or G Suite. However i wonder how often it would be blocked by useless "block all Russia and China" firewall rules.
I disagree completely on this. People get bank statements, investment transaction statements and other important information as attachments, and they may need to get those years later from emails (it may not be easy to get from the original source and they may have lost their local copies).
Like it or not, e-mail is a document storage medium for most people.