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WhatsApp seems set on introducing ads, but they won't appear in your inbox
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Either they haven't rolled this out in your country yet, or you haven't updated the app in a while.
The app is up to date. Maybe you're right and they only deployed this in some countries. How long ago did this show up for you?
I don't use it myself, I've see it on a friends' phone, so good question. Was a while ago though, a few months, maybe?