Probably this here is meant:

"Usage information. This is information about the Grammarly Site, Software, and/or Services you use and how you use them. We may also obtain data from our third-party partners and service providers to analyze how users use our Site, Software, and/or Services. For example, we will know how many users access a specific page on the Site and which links they clicked on. We use this aggregated information to better understand and optimize the Site."