Ruby on Rails most popular among top Y Combinator companies

Y Combinator, an accomplished investment fund and startup incubator, has published a list of its top 100 graduate companies ranked by valuation as of October 2019. 8 out of 10 most valued companies in the ranking were built using Ruby on Rails.Among the top 10 companies on the list such as Stripe, Airbnb, Dropbox, 8 use Ruby on Rails as their backend framework. In the top 10 only 2 non-software companies opted for another framework. Only one is based outside San Francisco. React is the most popular Javascript framework among those top companies by far. Hacker News commenters agree that Ruby on Rails is great for MVP development, quick iterations and scaling.