One need not perfectly discriminate. Any discrimination eats consumer surplus. It is a major concern. It is used in booking sites, and it will be used in other

One need not perfectly discriminate. Any discrimination eats consumer surplus. It is a major concern. It is used in booking sites, and it will be used in other sites. We can not rely on regulation. My point stands: User targeting is a threat and we, the users, are entirely justified in not liking it.