About these legal issues and situations.... I don't think it affects any of us as we don't provide any server side like they did. Whatsapp did it to protect itself against spam lawsuits because that API was abused to send massive spam messages and to regular users it looked like Whatsapp company sent those spam messages. I would act the same as Whatsapp company did so stop spreading hate around. They have nothing against unofficial clients as long as they don't mess up anything or make a bad name for the company.