Don't see why it matters if it has or hasn't.

There is no justification in a tool that collects account IDs and maps characters and alts to a single ID in an unsolicited manner.

Besides most people just aren't going to immediately know if their stalking or harassment is as a result of this third-party tool or not. People do not have crystal balls, they aren't practicing wizardry. They are going to be concerned about harassment long before, and the fact remains this tool is a very big enabler of this (when there is no other justification for it to exist). Further to this most people are just not going to announce their woes on the internet. Some might, but it's hardly a norm circumstance.