Can't imagine why anyone would think it's a good idea.
A browser leaking browsing history was considered an outright bug (https://blog.mozilla.org/security/2010/03/31/plugging-the-cs...).
One could standardize a list of things people would want to fill out about themselves (i.e. please put in your age and sex or else we can't guarantee you won't be hassled with ads of things completely irrelevant to you), but your software inferring things about you and snitching to the world is outright malware.