I do not understand why Ukrainians use Telegram at all tbh. We had a documented case from part of then occupied Kherson where FSB fell for a smoke test. Unfortunately not everyone got out. The excuse to talk to relatives in Russia and the occupied territories is less compelling of late. My guess is inertia.
100% inertia. TG has great features, is easy to use, and it's an easy sell to slavs because the company head is a slav himself. Decaf version of pan-slavism. They love eachother until they hate eachother.
Actually TG is a very flawed by design product that's showing it's age and limitations. But it's very easy to use, and ease of use trumps all in most cases- see: SMS/texting which should never have been born and should have died a long time ago.