Twitter impersonation cases are out of control

The Twitter Rules say: "Impersonation: You may not impersonate others through the Twitter service in a manner that does or is intended to mislead, confuse, or deceive others". I have detected an account (very likely to be a bot) that is posting exactly the same tweets I post, with 5-minutes delay; including mentions and pictures, which mislead people who is being mentioned. That is clearly an impersonation case, but Twitter says that they don't mediate user content UNLESS it violates the Twitter Rules.

Doesn't a bot that replicate your tweets violate the Twitter Rules? Is being Twitter negligent?