Should porn watching be secret or should it be transparent? I would say the only reason people have any discomfort about porn is due to the in my opinion primitive fear of human sexuality.

Sex in the form of porn is therefore given a negative connotation. There is also the link people make connecting porn to sex trafficking. I'm not really sure this link is based in reality but there are arguments that all porn is "evil".

What is your opinion of a blockchain like technology where people can watch porn and follow others who watch the same porn? This would make it transparent and reduce the fear of surveillance.

For the most part you are correct. Cookies do know what porn we watch and these cookies are all forming a digital footprint.