somehow using cloaking to purposely take over the dating site's lisint in Yahoo. Is this possible?
I've seen it happen with an affiiate site "taking over" a product merchant's #1 listing for the primary search term, but it definitely wasn't cloaking in that case and was unintentional on their part. However, this merchant protested paying the commission even though there was NO violation of the affiliate agreement in that case.
Are they emulating the identity of the dating site, trying to give the impression that they're actually the merchant site? Whatever the affiliate is doing, are they still complying with the affiliate TOS regarding trademark? If they're in compliance, it's strictly a search issue.