What is the main purpose of Power hub?

Like Data Export Service (DES), one of the main purposes of power hub is to replicate Dataverse data to a Microsoft Azure SQL database stored in a customer owned Microsoft Azure subscription. The installation and setup are very simple and user-friendly and can be implemented on a customer environment in a few hours.

Microsoft announced the deprecation of the Data Export Service April 2023 (Extended)

In this article https://powerapps.microsoft.com/en-us/blog/do-more-with-data-from-data-export-service-to-azure-synapse-link-for-dataverse/ Microsoft's Program Manager wrote that in November 2022 it will reach its end-of-support and end-of-life cycle. (April 2023 with application for extension)

Wave 1 2023: Enhancing control of your Strategic Portfolio management with customizable features.