A business transaction is mutual information - we both know it went down, and we both can share that information at will... ignoring legal and market incentives

A business transaction is mutual information - we both know it went down, and we both can share that information at will... ignoring legal and market incentives to stay quiet (eg medicine, sex toys). My problem is unjustifiable aggregation of data that provides personal information. If a stalker gets some information from the vendor, the problem is the stalking behavior - deriving an intimate view of my personal life without justification. The line has been crossed, whatever they use the information for is just additional problems. Commercialized stalking isn't OK on or offline. I have no problem with HN tracking that I visited this thread - mutual information - but services deriving personal information using this visit as one of many signals is crossing the line.