If you just surfing your mobile data for applications uses internet connectivity like banking, google chrome, whatsapp messenger, youtube, third party upi app, 25GB is enough for them at this cost.
Major telecom arguments with plans prices with those demands unlimited data at low price which will be risky in business, it also use high frequency and cost of maintenance, that's why Jio uses 2GB per day conditions for unlimited data in 5G and other's will always follows,
It's just like Apple made first attractive design in iPhone then Google Android manufactures will trying to copy to sell them in low cost. If you look around Jio complementary apps are like Apple similar application.