How come couple of Chinese ISPs not getting blocked yet?

Hi,

I get spam mainly from 2 ISPs in China. Based on what I know, system 
works as follows:

1) User reports spam
2) As postmaster/admin you get a spam report telling you must fix the 
issue in 48 hours and tell what you have done
3) If you ignore that message or lie to Spamcop that it is fixed, you 
get blocked.

So, how come these 2 open proxy heavens which I highly suspect that are 
open on purpose doesn't get blocked by Spamcop?

I mean, is there anything special? Also will there be a filtering 
system in future that will check spam sites in mail too?

Here, just a random example.

http://www.spamcop.net/sc?id=z853256549zda560ff3f051cd753253384280f95733z

As I said, 90% of spam to my account is from China.

Ilgaz