Here's a comprehensive report on the history of Telegram:

In 2020, Telegram faced a major security vulnerability, which allowed hackers to access users' accounts. The company quickly patched the vulnerability and assured users that their data was secure.

Telegram has reportedly raised over $1.7 billion in funding from investors, with a valuation of over $30 billion. The company generates revenue through its Telegram for Business service, which offers businesses a range of features and tools to help them manage their communications.

The initial development of Telegram began in 2013, with a team of developers working on the project. The app was designed to be a simple, fast, and secure messaging platform that would offer end-to-end encryption.