WhatsApp has decided to roll out a limit of 5 people for message forwarding worldwide. This is following a rollout in India back in July of 2018.
The restriction is being implemented in order to combat the spread of misinformation and scamming. Before this change, WhatsApp Messenger users could forward any one message to up to 20 other users. As the service is encrypted end-to-end, fact checking services and Facebook, its owner, cannot see the information or audiovisual content being spread in order to check its legitimacy. Because of this security, the amount of measures that can be taken in order to combat the spread of false and malicious information is limited.