"... it's still difficult to believe that any of the recent startup school candidates will ever grow into tech darlings like Airbnb or Dropbox did." It was onc

"... it's still difficult to believe that any of the recent startup school candidates will ever grow into tech darlings like Airbnb or Dropbox did." It was once difficult for many people to believe that Airbnb or Dropbox would become ... Airbnb and Dropbox.