If you actually wanted your site or service to be accessible you’d run in to issues immediately since once IP would have cycled between hundreds of homes in a year.

IP based bans have long been obsolete.

No, no they haven't. A bad behaving network still has to answer to 2-3 bad IPs, and if it doesn't.. it's obsolete.

https://news.ycombinator.com/item?id=47246044