Even if the services advertised are effective in providing services that may interest them, the fundamental violation of privacy entailed in compiling personal search data is too serious a danger to people than the fleeting benefits that this sort of advertising might furnish. But this form of advertising is often not as effective, since its reliance on programmes that stereotype demographics can often result in misallocation of advertising. Furthermore, the discomfort people feel at this advertising means they do not like experiencing it, useful or not.