Signing up for an account is just more explicitly forking over and sharing data. But you're being tracked by every possible method, and it is possible to piece together the remaining information.
Did you even read my comment? The typical pihole lists already include tracking domains.
What you imply is that if I visit youtube.com with tracking disabled, they still create a profile of me. Then tell me, what unique identifier do they use?
Maybe they have machine learning which combines a couple of factors and then create long-term profiles based on the likelihood of some data belonging to the same person.
That would be illegal though.