Using an unofficial WA bulk sender can be highly dangerous. This is because these types of applications are typically created by third-party developers, rather than by WhatsApp. As a result, you may face several risks such as possibility of your device being blocked by WhatsApp and increase the vulnerability to hacking.
To avoid these potential risks, it is recommended to use official WhatsApp bulk or WhatsApp blast services offered by a WhatsApp API Official Business Partner or a WhatsApp Business Solution Partner. One such provider is Mekari Qontak.