Assuming you notice it was deactivated within the short time span they give you. If you're a casual user it could get really annoying to show up and be deactivated, most likely when you have a fairly urgent need.
I live in America so I really only need to use WhatsApp when I travel to foreign places so I can contact vendors. That happens maybe once every other year. I'd be pretty upset if I fired up WhatsApp and it didn't work when I really needed to call a vendor.