Isn't the sbl-xbl.spamhaus.org blacklist a list of IP's that are used by email spammers? I'd expect that to be successful for blocking email spam, but that is not the same as blocking anonymous http proxy sites like Proxify.
countrycheck.com used to try to keep track of anonymous http proxy servers, but they seem to have gone out of business. Their site has contained just an error message for a few weeks now.
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