WhatsApp messages from different users consume storage space.
Business Insider reported that Facebook designed a facial recognition application between 2015 and 2016.
Instagram was bought in 2012, WhatsApp was acquired in 2014 by Facebook.
The problem is not just with WhatsApp, but with Facebook and Instagram as well.
Initially, when WhatsApp was launched by the founders in 2009, the services were offered as a paid-for app.