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I have never used Telegram simply because it's closed source IM with unclear funding. I have an account to read some Telegram-only groups but use it through a bot bridging to Matrix specifically to avoid having Telegram client on my phone.
Over the course of two years you could however see plenty of journalists, public administration official and politicians openly using Telegram and ignoring the "ban", for example:
https://news.rambler.ru/internet/43254760-rossiyskie-vlasti-porekomendovali-polzovatsya-telegram/
