Hi Sam, nice to meet you.
For kicks I just clicked on the “unsubscribe” link located as expected at the bottom of a WikiTree daily email. From there it asked me to login (thankfully, as I like reasonable layers of security). One click from the drop-down list gave me the “settings” page where I could unsubscribe or manage other account issues.
I say you are right in that some are easier to unsubscribe from, just one click.
My opinion is that WikiTree still makes it very easy as long as you don’t mind logging in one last time :)
Cheers!