There's an entire subculture of fake "you can do anything" motivational stuff on the web. The purveyors are direct descendants of Tony Robbins and Dale Carnegie and whoever was selling that stuff before him.
I don't think thats necessarily true, but I also think that Medium has that kind of connotation for me.
I think the lack of branding on Medium sites has something to do with it. People ended up lumping everything as "Medium articles", from spammy "growth-hacking" articles to well-researched, well written investigative article.