This plan is the following - if you take Airtel Zero, you cannot access any other website. Period. That's right, no option to pay for other websites at all. Once you opt-in, your web is restricted. This is not like the plans for poor we already have, where you pay little or nothing for some websites, but can use regular plans to access rest of the web. With the new Airtel Zero, you waive off the rights to rest of the web as soon as you opt-in.
This is a net neutrality debate. We have plans for poor, this is not it.