It's actually more work to give you one address (a /128) than to assign you a /64. Everything in ipv6 assumes a /64 is the basic unit of allocation. For examp

It's actually more work to give you one address (a /128) than to assign you a /64. Everything in ipv6 assumes a /64 is the basic unit of allocation. For example, the stateless autoconfiguration system that replaces much of DHCP assumes it has a /64 to work with. Linode probably has 4 billion /64s to play with (with options on trillions more if they should need it), why not give out one per customer?