internet - Wikipedia blocked again

After the initial cheers when the blockade of Wikipedia fell and its traffic surged, now the IP-blocks are back in place again, reports Andrew Lih.
Now, why would that happen? Unblocking the Wikipedia IP-address was - as others also have noted - perhaps because the keyword filtering has been improved, so flat blocks were no longer needed, the censor thought.
It looks like Wikipedia has been used to test that assumption. When my assumption is right (assuming things is very popular in these cases), then the test has failed: the keyword filtering is not good enough to replace the IP-blocks.
So, we use or proxies again. I wonder what effect it has on the Wikipedia traffic.