It's surprising to me that those people haven't been arrested yet. People get raided for far lesser offenses compared to running Tor exit nodes.

Exit nodes are a mistake. The web is a lost cause by now. Most sites already consider access through Tor to be abuse. Exit nodes are also the focus of the deanonymization attacks that I've seen. The Tor hidden service network should be strengthened instead. We should launch hidden services instead of web sites.