The black list operator they rely on [https://www.dan.me.uk/dnsbl ] checks hourly for Tor nodes to match against the VPSs.
What could be the motivation of the black list operator! If he answers I will let you know of any justification.
It's easy to see the rationale of the business. A third of my VPSs have dudded me like this.
Doesn't USA have proper trade practices legislation?