How will China use data it is gathering via espionage?

It is a well-known fact now that China has been indulging in espionage activities in India and America. It has been gathering data about the VIPs of India like the Prime Minister Narendra Modi, former PMs, Chief Ministers, DGPs, Indian Defence personnel etc.

But what will China do after gathering all the data? How will it use it against India? Here is a report explaining about the same at length.