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My guess is that the defaults are designed to block a similar amount of spam if possible?

Most major mail providers have access to one or more ipv4 addresses. This allows for reputation + it's a bit more wasteful to burn through ipv4 blocks on spam campaigns.

ipv6 address are plentiful, so you can burn through them on a spam campaign.

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IPv6 addresses are more plentiful. However, you don't assign reputation to an individual IPv6 address but rather to an IPv6 network prefix (a /64, or even /60). That gives roughly the same granularity as a single public IPv4 address: one ISP subscriber.

False, the cost of a prefix is MUCH MUCH lower if you are looking to spam via ipv6.

Total prefixes are 18,446,744,073,709,551,615

Naturally there are far more IPv6 /60s than IPv4 /32s. As a spammer, though, you don't get to pick just any /60 prefix you want—it has to be allocated to you.

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