The real tinfoil hat is assuming that they allow it because it's compromised; the founder of Telegram has absolutely no love lost for the Russian state, they basically seized his company (VK; a hugely popular facebook-like which also has a music player and such) and all his assets that were in the country after trying to exert control over him (and his desire not to be controlled); that's why telegram was founded in the first place.
Of course, I have no first-hand account except watching as my video game became unplayable for Russians while the Telegram blocking was happening and my GCP rep explaining it to me, and that I had an Estonian girlfriend for 7 years who was giving me the play-by-play on what was happening.