Its worth remembering that whatsapp used to have an annual charge, and it grew successfully with that. The charge was only removed once FB bought them.
Personally I don't know anyone that started using whatsapp after the fb purchase, so they were all happy to pay for their use of a messaging app.
Personally I don't know anyone that started using whatsapp after the fb purchase, so they were all happy to pay for their use of a messaging app.