Commands must be singular words that prefix a message sent by a user. We don’t require you to use a prefix if you don’t want to, but typically exclamation marks tend to be used to avoid confusion in chat.
We do not permit keyword commands at this time. Keyword commands imply they can be executed from anywhere in the input a user typed.
I think an option from someone who owns the youtube channel could have a check box to apple for keyword commands be permitted in the sentence. It would generate alot more traffic!