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They have a very long list of "banned domains" which you can request from antifraud at 7search.com
I would recommend that you not allow traffic that comes through on that list because they will not compensate you for it.
If you are sending "non fraudulent" traffic and non-proxy traffic, you should be ok and make alot of extra money with their feed.
For advertisers, 7Search is a very good engine to see results because they do refund money back to an advertiser if they deem a click bad.
If you are a publisher, there is no guarantee that you get all your money by the end of the month.