That's true, and experiences may vary from country to country.
US authors could perhaps include a footer until they don't.
Ultimately, following an author is a form of association, and freedom of association should permit them to end a relationship.
This was the only reason I could find to justify posting occasionally.
I could post an annual slur of some description, so those who don't want to be associated with the account have a valid, compelling reason to unfollow.
I'm very much open to suggestions, though.