One potential scenario is bypassing rate limits, enabling abuse, scraping etc. because of the large IP blocks each customer is granted, and seemingly the lack of standardization there.

The assumption of there being a finite amount of IPs to cycle for an attack doesn’t entirely hold with IPv6, and seems like not all software is configured to take that into account.

Explained here better: https://adam-p.ca/blog/2022/02/ipv6-rate-limiting/