> More specifically, this article should really define what MasterClass is right at the beginning. Because given the picture at the top, I thought it was referring to the generic masterclass

It does, MasterClass is capitalised in the title showing that its a proper noun and the by-line is

> And other lessons from a 9-figure edtech startup

Not sure how the author could define MasterClass more “at the beginning” than in the title and by-line.