https://core.telegram.org/techfaq#q-why-did-you-go-for-a-custom-protocol
Interesting read. I use this app just for the sake of using it when I can.
FAQ for the Technically Inclined
Related Articles
October 7, 2012
One-Liners to Improve Server Security | SiteKickr Blog
October 21, 2013
Men's Health: The Weird Way to Earn People’s Trust
June 24, 2016