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4eyes - 5:59 pm on May 11, 2002 (gmt 0)
Clearly you think they cannot check automatically, and I am unable to shake this belief, but automatic checking is not the main threat. The main threat is being 'turned-in' by your competitors and triggering a manual inspection. People will 'turn you in' for cloaking just because you are above them and they don't know how you did it. Cloaking a site maybe OK for short term gain, but if I am investing time and money in building link popularity etc, I don't want to risk losing that by using cloaking and getting caught. Sure, cloak your paid pages on gateway sites - but I think the increasing dominance of Google makes the return much less. For most sites, the effort is no longer worth the risk.
It would seem foolish for them to use any IP associated directly with them.