“…not to give non-rabbis a title which they have not earned….”
As Wolf so eloquently pointed out, the title “Rabbi” is meaningless. It does not mean what it did, say 200 years ago (or even 30 years ago) in its general usage. Sure, the technical meaning has not changed, but people are not using the term for its technical meaning.
It’s like the term “Askan”. Now, anyone who can photobomb a picture with a politician or some other knocker calls himself an Askan. The term as it is used today does not have the same meaning as the term when it was used 40 or 50 years ago.