I decided to focus more on improving and developing new RSS integrations, so I'm starting to turning down other types of integrations. As a first step I disabled adding new non-RSS integrations. All existing integrations will be supported until 1st of May. After that they'll be shut down.
You could use Zapier instead. It offers various types of integrations and also supports Telegram channel messages → HTTP webhook integrations (you should first create Telegram channel → RSS integration, though).
Let me know if you've any questions.