It's because they're favored by the HN community. Few startups manage to achieve this 'darling' status on HN.
I wrote about this phenomenon here: https://news.ycombinator.com/item?id=30070287 - in the bottom third of the comment, starting with "Stripe succeeded on HN". (Skip the tedious stuff before that.)
I wrote about this phenomenon here: https://news.ycombinator.com/item?id=30070287 - in the bottom third of the comment, starting with "Stripe succeeded on HN". (Skip the tedious stuff before that.)