The reason bankers and the wealthy are throwing mountains of capital and political leverage behind mass adoption of cashless societies is the greater control it offers. If they illegalize cash and paper money. Then they have complete control over monetary transactions. They could ban demographics whose politics, opinions or views they dislike and there would have no other system they could utilize to buy or sell things. That's the motive behind the large campaign pushing "cashless society" as an ideal.

You can see something similar happen with internet personalities that are banned from social media, instagram or youtube. That's the future the rich and powerful want for money. To create a cashless frontier where they can simply ban anyone who doesn't adopt their values, politics or lifestyle.