WhatsApp knows you’re fed up of receiving marketing messages, so it’s charging businesses more to send them.
https://www.techradar.com/pro/whatsapp-business-is-changing-messgaing-rate-to-cut-down-on-spam
https://www.techradar.com/pro/whatsapp-business-is-changing-messgaing-rate-to-cut-down-on-spam