The thing I liked most about WhatsApp is that it had a sustainable business model that did not require it to screw its users: you paid for it, just like you pay for electricity or petrol in the offline world. And now it’s been gobbled up by one of the “siren servers” that makes its money by spying on its users. Bah!
I also admire Jan Koum, WhatsApp’s co-founder and CEO, who seems to me to be one of the sanest people in the Valley. This interview (with Kara Swisher) gives a flavour of the man.