[Terr_]

The first claim? The "hounded by Russia" one? I'm not familiar with the story, but some quick searching reveals this:

https://www.engadget.com/2017/10/16/telegram-fined-by-russia...

The prime source seems to be founder Durov's social-media posts, retelling his communications to/from regulators.

[eps]

No, the OP's claim, not theirs.

Re: a huge office & a server farm.