I'm still OK with Yahoo but Google is a nightmare.
From all that's being said I get the impression that public proxy lists are getting very quickly banned by Google AND they're very quickly jumping on multi-threaded requests using the same complex operators, regardless of the IP's being used. It's simple stats really - how many NATURAL simultaneous requests come in for, say, inurl:/register intext:"upcoming" intext:"published" intext:"submit" intext:"Tag Cloud" -inurl:.php etc.?
Whatever the real reasons this has all started to 'terminate with prejudice' in the last month or so.
From all that's being said I get the impression that public proxy lists are getting very quickly banned by Google AND they're very quickly jumping on multi-threaded requests using the same complex operators, regardless of the IP's being used. It's simple stats really - how many NATURAL simultaneous requests come in for, say, inurl:/register intext:"upcoming" intext:"published" intext:"submit" intext:"Tag Cloud" -inurl:.php etc.?
Whatever the real reasons this has all started to 'terminate with prejudice' in the last month or so.