Proper way to ban users writing via channels

[eugenweissbart]

As of now, when you try to ban a user who is writing to a group using his channel, instead of blocking the channel, an internal TG entity called Channel_Bot is banned.
A proper way to block the channel would be to issue a banChatSenderChat command. To distinguish that it is a channel writing to the chat, you might want to check that from has it's is_bot set to true (may also want to check if username is Channel_Bot but I guess it's not required) and a message has also sender_chat key with it's type set to "channel". The id of sender_chat is what to be the second argument to a command, first one being the chat's id.

[backmeupplz]

This is a valid concern, I'll be happy to review and merge a PR that fixes this :)