Bots are used on Telegram for tons of purposes, so a lot of data is exchanged between the user and the bot.
For example, there are userbots that can receive messages from people who are blocked for spam or to create a platform to exchange messages in "anonymous" way.
Adding the possibility to make secret bot chats will add a layer of security, and this would be a really good thing especially for people who have to avoid things like censorship.
This is the list with all the suggestion cards regarding how to improve E2E-Encryption implementation in Telegram, make sure you vote and share them :)
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Secret Chats and Groups on every app and device supported by Telegram (Android, iPhone / iPad, PC / Linux, macOS, Web/ browser): Secret Chats and Groups on every app and device... #8631
Make Secret Chats and Group Messages Synchronized and implement a Back-Up option: Make secret chats and group messages synchroniz... #8307
Secret Group Chats: Secret group chats #1231
E2E Encryption for Saved Messages: e2e encryption for saved messages #2264
Implement Secret Channels: Implement Secret Channels #8707
Implement Secret Bot Chats: Implement Secret Bot Chats #9229