If you are looking at the data costs at this link on NSE, it is the cost fora data vendor and not an end user of data.
As an end user, if you want data on amibroker, Ninjatrader etc, you can use one of the data vendors who charge between 2k to 5k per month. If you want data on a custom platform and for your own use, you can use Kite APIs.
Yes members do get data for free from the exchange, but the cost of setting up your data center, connecting to the exchanges via leased lines, building a product that can read exchange raw data feeds, etc is not worth the effort/cost if you are trying to use it for yourself.