Judge Santiago Pedraz of the National Court has ordered the blocking of the Telegram messaging platform in Spain. This is a precautionary measure in response
It's more the attitude that bothers me. Signal's refusal to support alternative appstores and clients is very disturbing. It gives the impression that Signal is a honeypot.
You seem to have really high standards around who you trust and in the same moment you call Telegram secure. I feel like you should atleast use the same amount of scepticism for Telegram that you use for Signal.
The official version of Telegram isn't available on F-Droid either, and it doesn't use end-to-end encryption by default, so it's much more likely that it is a honeypot
That is not the official Telegram app. It is a fork called "Telegram-FOSS". If you go to the F-Droid page and click on 'Source code', you will see that it links to this repo: https://github.com/Telegram-FOSS-Team/Telegram-FOSS
This is the description of that GitHub repository:
Unofficial, FOSS-friendly fork of the original Telegram client for Android