Telegram is categorically less encrypted than Signal for most chats. It's mostly the same level of security as Facebook Messenger, Instagram DMs, even Email (SMTP/IMAP over TLS) or SMS: it only encrypts communications between the client and the server. Telegram can read everything you send in regular chats. The only way to get end-to-end encryption (such that Telegram technically can't access your communication) is by starting a fussy and inconvenient "secret chat". It can only be done between two people (so no E2E group chats at all), only when both are online at the same time, and it only works on the devices on which the secret chat was initiated and accepted; in other words, as a frequent user I've only used it once for some really sensitive personal information. Even then Telegram still has access to a lot of metadata about messages: phone numbers of both parties, when the messages are sent, how big they are, etc.

I'm not saying that cooperating with intelligence/LE agencies is always an ethical, or even a good choice, but Telegram demonstrably had the ability to do so.

Navalniy and his team openly supported the annexation of Crimea (and destruction of Ukrainian and Crimean Tartar culture).

Not really: https://www.nytimes.com/2014/03/20/opinion/how-to-punish-putin.html ; this is just days after the annexation. I'm no fan of Navalny for various reasons (his nationalist views, xenophobic comments and narratives, etc), but he was very much against all Putin's shenanigans in Ukraine, and vehemently anti-war.

The recently exchanged “dissidents” also showed their true colours by supporting the annexation of currently occupied territories in Ukraine.

What are you on about? Name one of them who supported the war. Most of them were jailed due to their anti-war positions.

Upon further inspection, it's almost definitely AI. Look at the better-quality original: https://in.pinterest.com/pin/937874691150982659/

In particular, note the nonsensical reflection in the mirror (which is inexplicably placed on the floor?), weird toilet paper roll, and half-unicorn horn half-third ear thing sticking out from the head.

And if you check out that Pinterest account, it's full of AI-generated crap too.

Which mostly just demonstrates how good the AI has become, to the point where if you scale down the image somewhat, it fools humans and AI detectors alike.