There are rivals, but none is able to rise up to the top so far. The new ownership lasts until present and most likely until forever. Developed by Jan Koum and Brian Acton, the messaging service was finally bought by Facebook on 2014. Its first release was around 14 years ago. Their fear is a reasonable one since Facebook has been involved with privacy issues such as Cambridge Analytica scandal.
Its relationship with Facebook, however, have put off a number of users who concern a lot about privacy. WhatsApp is well-known as one of the most phenomenal messaging services ever built in history to date.