TL;DR (without my opinion added): Top Management started too late to think about making actual money. They also hired an asshole for their US offices. When they got an opportunity to be bought by Twitter they asked for way too much money. And the CEO is bascially on a constant holidays trip since 2014, while not failing to rub it in everybody's face via Instagram photos.
Personal opinion: I don't understand these CEOs who start cashing out before either selling their business or making it a viable paid service, while being so close to a lifetime solution to the problem of money. I mean he already went 80% of the way, much further than most.