This is indeed a big allocation, but this is misleading in IPv6 terms. This is equivalent in ~2 billion (2^31) /48 allocations (which is the smallest you can ro

This is indeed a big allocation, but this is misleading in IPv6 terms. This is equivalent in ~2 billion (2^31) /48 allocations (which is the smallest you can route via BGP) or ~140 trillion (2^47) in /64 terms, which is the literal basic unit of an IPv6 network (equivalent to having a single NATted IPv4 address). It seems to be big only because some server providers are too stingy to their IPv6 allocations (some of them only allocating one IPv6 address per server) that it flies in the spirit of relevant RFCs (and sometimes just straight up unamiguosly violate multiple RFCs).