Overall, the concept is good and there is a good chance of it being highly significant in the long term. In practice, however, there is still a long way to go.
Firstly, cashback is only relevant for people doing searches in circumstances where they intend to buy. Lots of searches have no connection with purchases - they are just looking for information. One of the great things about search engines is that they serve the searchers’ requirements well regardless what they are looking for. If cashback is going to succeed, it may need to be convincing enough for users to shift all their activity to a different engine.
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