Most service providers like Vultr provide /64 ip ranges, which provide us with 18,446,744,073,709,551,616 addresses. In theory, we could use IPv6 and rotate the IP address we use for every request, bypassing this ratelimit.

This usually doesn’t work, as IPv6 rate limiting is usually done per /64 range (which is the smallest subnet allowed per the IPv6 spec), not per individual IP.