https://ioptout.ca
Not sure if this is a well-known service or not, but I found it just now while reading about the new copyright act.
I signed up and took my name off a pile of lists. The Herald, The Sun, a bunch of charities, etc etc.
We'll see if it works!
(I also selected the option that deletes my personal info from their server 24 hours after they submit my do not call requests to the various organizations.)