Its only a 24 hour ban, and it seems to be random. A lot of people using 3rd party apps have been affected, as the point is to discourage the use of the third party apps. Many app devs on android have overcome this problem by updating parts of the app so as to remove the clues that show it is a third party app to whatsapp. I presume a similar method could be implemented to sailfish/harmattan adaptations of whatsapp, following that of other app devs.