Afaik, Airtel still does it and people still put up with it. I think they do the usage % notification hijacking as well without understanding even a bit that that internet is a pipe and people use applications other than web browsers and protocols other than http.

Yea I was not sure. I left them after their data cap for "high speed" "unlimited" internet cap was 3 gb per month. I can put up with js injection but ridiculous data caps are something I can't live with.