Medium doesn't "hurt your credibility" nearly as much as revealing that one's arsenal of litmus tests is suffering from such a paucity of real knowledge that one bases it on the web design, but Medium has a lot of annoying popups. A lot of people like Substack better and they have a paid subscriber thing that works well.

(realistically speaking, experts tend to know less about the blog hosting ecosystem the more they know about their domain)

its just a "tell" that you dont mind the poor reader experience and being associated with the rest of low quality slop that is on medium. many of us here have simply given up clicking on anything medium related