The tone is inflammatory and that graph is a joke. Changes are a function of two factors whereas advisory focuses on only one dimension. With unique insight authors claim to have, I'd expect something more comprehensive.
That being said I'm pretty sure that some will be unhappy with the change. As andraz mentioned in another comment - moat gives leverage. But even though I'm pretty sure GitHub is fairly elastic in terms of pricing with large enough companies (with large enough probably still being not that large), I find it hard to believe that their bottom line suffers. This means that customers are picking up the tab and as silly as this article is, prices did go up and some people should migrate.
