A lot of the others are real ISPs, so I wouldn't count them in. It's a totally different scenario.
The company at the top of the list Softbank would fit that description of "a real ISP" perfectly: one of the largest telecoms//mobile providers/ISPs in the world (not to mention one of the largest data center owners/operators). $64.8 billion (6.6 trillion Yen) revenue in FY2013 and
projections are for $71 billion this year. They have literally over 100 million customers (they also own 80% of Sprint in the US). It's not surprising that they (or companies like China Unicom/China Telecom) would rank near the top in Spamhaus' worst list which ranks by total SBLs.
What is surprising is that a tiny little company from the sticks with a (self)projected $12 million in revenues has over 5 times more total IP addresses blacklisted than a giant like Softbank.
edited to add:
Biloh has been whining that Spamhaus doesn't understand the "commodity budget cloud VPS market bla bla bla" so here's a comparison: ColoCrossing vs Hetzner (Hetzner is a budget dedi provider that counts many VPS providers among its customers, its server prices not counting IPs are cheaper than CC, Hetzner's size makes CC look like a fleaspeck, etc.)
ColoCrossing 43 SBL's totalling 460K blacklisted IPs (oldest open SBL is from February)
Hetzner 1 SBL totalling 1 blacklisted IP
http://www.spamhaus.org/sbl/listings/hetzner.de (oldest open SBL is from today.)