I saw this in the news, something about stopping the spread of 'fake news'.
The initial 6 month trial in India was certainly linked to the rapid spread of false rumours Dez, some of the rumours had seen hysteria led killings.
Following the success of the trial, in India, the message limit restriction, has been extended globally from this month.
Interestingly, the restriction can only be applied during your next App update, as it rolls out across the World. So it would seem that WhatsApp's globally imposed restriction effectiveness will be gradual but far reaching, over time.