Talk to the creators of WA aka Facebook, they made this mouse game. They can make WU an official client, but they don't. And of course if WA never will be open it is better that people choose for alternatives like for example Telegram. But 95% of my contacts are using WA, and if I talk about alternatives they look at you like .... Huh? What? Why? Freedom?

So as long I need WA, I hope the creators of WU still can continue there amazing job.