I heard that big data will be valuable. Is there a company that sells data? How do they do business models?

That's a lot. Many companies intercept your information and sell it directly. Some tempt you to make a phone call and fill out a form, which is a way to get your information. So now some blockchain companies also claim to help people realize everyone's big data, such as Gongxinbao, and directly log in and sell it, such as Zhilian Ecology, which directly allows you to make a local area network, leave the data there and then package it for sale.