ANI does not typically come with end-user lines, and is (sadly) also spoofable. There are already some systems for fraud analytics, but thye have their own issues.

A user can request a "trace" (usually by dialing a feature code), but not only does this hit the user with a ~$20 fee each time, but the information gathered can only be released to law enforcement, and since local law enforcement would need to make the request, it rarely happens.