

No. WhatsApp came first, but later adopted Signal’s key exchange and encryption. WhatsApp was an independent company for years and had rejected several acquisition offers, but $19 billion is a big number.
One of WhatsApp’s founders is now chairman of the Signal Foundation and a major financial backer of the project.
That’s a risk, and a reason I’d like to see something federated succeed in this space. Unfortunately neither Matrix nor XMPP has managed to achieve quite the level of UX necessary for mainstream adoption, nor have the average person’s tech skills and comfort level improved.
Signal’s status as a well-funded nonprofit gives me hope that the current situation is reasonably stable.