@vees I often wonder if people blocking an entire /64 or /56 have any idea how many systems they may be blocking by doing that.

If you use DHCPv6, you are likely supplying #ipv6 addresses to potentially thousands of computers on the same /64.

Maybe that is what they want to do. Maybe not. But to assume that a /64 is given to one computer/server/home etc. can be wrong a lot.