WhatsApp is becoming a super app through the buildout of business messaging. You can now do your shopping in India using the JioMart store on WhatsApp.[1]
Yeah nobody uses that. Payments is super easy to integrate because of UPI but otherwise no one is going to shop on WhatsApp and if WhatsApp gets significantly bloated people will simply move on to TG etc.
[1] https://about.fb.com/news/2022/08/shop-on-whatsapp-with-jiom...