As of July 1, 2018, California also has a law requiring that services you've subscribed to online allow you to cancel online (from SB-313). This should apply to any US company doing business with a California resident.
I've heard that for the Wall St Journal only members with California mailing addresses get access to the online form, everyone else has to call. So the way to get around calling is using privacy.com with a California mailing address.
