why do you stand against Telegram as a secure and optimal solution for the majority

Because it isn't secure. It is marketed as being secure, and it is not. It is snake oil.

Just to clarify, are you aware Telegram is blocked in Russia by the government

yes, i am aware that they are (again) currently blocked. i'm curious your theory for why they were unblocked after the previous blocks? (note: please don't actually reply to this question here; see end of this comment first)

mostly because the former does not want to share data with the government standing for the privacy, if I am not mistaken?

yes, you are mistaken.

Russia has strengthened and later weakened their restrictions on Telegram various times over the years for reasons which are probably unknowable without insider information. What is clear is that Telegram is absolutely sharing data (which they've chosen to design their service such that they can have access to) with various governments at various times; assuming that they never would share any with Russia is nonsensical. The extent to which they willingly share which data with which governments, versus which governments access data without their cooperation (by compromising their servers or coercing their engineers, which gives access to message contents due to their lack of e2ee) is not particularly interesting.