This is the full paragraph:

We collect certain device and network connection information when you access the Service. This information includes your device model, operating system, keystroke patterns or rhythms, IP address, and system language. We also collect service-related, diagnostic, and performance information, including crash reports and performance logs. We automatically assign you a device ID and user ID. Where you log-in from multiple devices, we use information such as your device ID and user ID to identify your activity across devices to give you a seamless log-in experience and for security purposes.

It looks to me that they are using it to identify the user uniquely, maybe also related to captcha to prevent bots (it’s common practice to capture mouse and keyboard while resolving captchas to see if the movement is human-like).