How to put Admob ads on WhatsApp app

[ashish2112]

Hello guys,
While I was surfing YouTube I found some videos showing how to put own Admob banner ads on WhatsApp app using Apk Editor app and share it to make money.

But what I found was the codes they give don't work if any of you can put my ads on app then please help/teach me how to do that.

Thanks for your help.

 

[BrandingCat]

Better don't.

 

[ashish2112]

Better don't.

But why
Is it illegal or Will my Admob account be banned?
I will just share that app with 100-500 people and as everyone use WhatsApp that will bring good income.