The social network is not nearly as valuable as the article makes out. It is only valuable insofar as the big banks are willing to trust you. If Societe Generale, UBS, Merus Capital, BNP Paribas, Bank of America, BlackRock, Citibank, Deutsche Bank, Goldman Sachs, HSBC, and JP Morgan all are a little skittish about Bloomberg controlling the platform, they can go somewhere else and tell the traders they have to use it.
https://techcrunch.com/2019/06/12/symphony-a-messaging-app-t...
The real killer app for Bloomberg is mortgage backed securities. It is data intensive, it is analytically complex and the second largest asset class, with 9 trillion outstanding, and you simply cannot trade them without a Bloomberg terminal.