I disagree with your premises as well as your argument.
WhatsApp, Instagram, and SnapChat are valuable because they have users. There are a million ways to monetize users once you have them, but it's hard to get them. Google, Facebook, and others are large, humming machines that squeeze money out of users, but WhatsApp, Instagram, and SnapChat are not. The latter three companies are valuable because they can be fed into the larger machines that already figured out how to monetize.
Unrelated: Uber certainly is a threat to a lot of companies (USPS, Zifty, DHL), but I can't see the Google connection. In fact, Uber and Google recently became partners.
If anything, Google is a massive, existential threat to Uber because it's working to perfect self-driving cars.