Telegram proxies can help people connect when Telegram is blocked. Telegram apps support them directly, so sharing a proxy can be as simple as sending someone a link.
I've used MTProxy to run my public Telegram proxy, which you can use if you don't want to set up your own.
A proxy cannot simply decrypt Telegram's encrypted message traffic, but it can observe client IP addresses, connection times, traffic volume and destinations. Its logs may retain that information. MTProxy is not a VPN or an anonymity guarantee, and it does not turn ordinary Telegram cloud chats into end-to-end encrypted Secret Chats. Choose an operator you trust.