Leaking whether somebody is in a public group isn't "cracking telegram". Clickbait journalism.

Imho the very idea of using phone numbers as a public identifier isn't adequate, and allowing any information on whether somebody with phone number X uses the service, in what groups they are, or when they were last online to be seen without their consent is just wrong.

Looks like Signal[1] is still the way to go. Interesting that the Chinese Government has cracked telegram even though it and Signal are not available in China without VPN [2]

[1]https://www.freecodecamp.org/news/why-i-asked-my-friends-to-... [2]https://startuplivingchina.com/list-websites-apps-blocked-ch...