A bit off-topic, could someone explain how data brokers operate? I've been involved in the development of B2B SaaS solutions, and there are a few providers, su

A bit off-topic, could someone explain how data brokers operate? I've been involved in the development of B2B SaaS solutions, and there are a few providers, such as ZoomInfo, Apollo, and Clearbit, that greatly assist the sales team in gaining a deeper understanding of customers. It seems that venture capitalists love those businesses. Has anyone attempted to create similar companies that offer Data as a Service?