Who can see my chats with Cosmos?

Your messages go to Clatter Labs to be answered by SuperCosmos. They're processed in pseudonymized form. Clatter Labs staff look at content only for support you request, security or abuse investigations, enforcing the terms, or when the law requires it, and only authorised people can.

Telegram also handles your messages as the messaging service. Other users can't see your private chat with the bot. Anything you share publicly, like a file link, can be opened by anyone with the link.