This is HN and we're not even pretending to be optimistic about beating incumbents, but it is much deeper than that - there is also a profound sense of defeatism directed towards European entrepeurs as well as the world at large. It is an indictment of the current nihilistic zeitgeist.
Well, it is a forum run by a Silicon Valley VC firm … so of course there will be a bit of “only SV can do anything interesting in tech” gatekeeping going on.