I think these types of quizzes are mostly irrelevant (even if sometimes fun). I don’t feel in the mood to answer 70 questions at the moment, anyway. I tend to disagree with just about everyone on many issues and am not really interested in finding an appropriate “label” for myself.
Yes, you don’t have to explicitly tell them who you are for them to figure it out just by isp and some other info. No doubt this is used to generate annoying push poll phone calls at election time, or by Russians to select what facebook ads to push at you during election time.
I also sometimes get pleasure from deliberately sending pollsters false information. The sad thing is I start seeing ads while browsing for guns and for religious singles groups. So I’ve made a habit of “just say no”.