Left to wonder how we learned before the internet. This is to say we have opinion presented as insight and common sense, which can be triangulated by listening and reading widely, presented as expertise.
So exactly what does putting some letters after your name add?
Fool some of the people all of the time, all of the people some of the time. Best to triangulate and definitely think back to challenge the marketing BS of corporates and people with letters after their name 😉