Had a similar experience - worked in a big ad agency who hired a new web-developer for one of our clients. As they are one of the biggest website providers, they could identify most of the people that visited a client's site - it even automatically saved the identified user's profile pic from facebook into their database.
As an engineer, I'm amazed. As a person who doesn't want the person on the other end of every website I visit to know who exactly I am, I feel violated. At this point though, all I feel I can do as a hapless consumer is to desensitize myself to said violation.
I use a VPN, Pi-Hole, Ghostery and Firefox. All of these a relatively recent additions though, so if a website can get my email and that links to an already existing database of all my collected data up to that point, I'm buggered anyway.