It is
It is not the publicity of Modiji but grabbing attention and eventually business in the name of PM or any other national figures.
Whereas Modiji later did say In one of his speeches to use online transfers and Paytm which definitely gave a boost to these companies. But why are the banks not promoting their Mobile apps or E-wallets. Every customer is forced to use Paytm as the vendors are aware of only paytm and the banks are not allocating their banks card swipe machine.
Ok
You are right
Banks not doing publicity of their e-wallets like payzapp, pockets, payapt, lime etc. Apps
So without offers, paytm getting popularity
Freecharge, mobikwik also good
But offers needed