I rented a VPS from them experimentally for a month, then left to go on vacation thinking I had cancelled it, but I had not. They left it running for another month that I hadn't paid for, and then sent the bill for the extra month to collections, so that's presumably affecting my credit score now.
Sending a bill for a recurring service to collections rather than just canceling the service is trash-tier company behavior, IMO. I strongly recommend against using Hetzner.