Its supposedly to learn typing habits. Heres how you turn it off.

https://www.privateinternetaccess.com/blog/microsoft-windows-10-keylogger-enabled-default-heres-disable/

Multiple. I understand that many of you won’t believe or just don’t know about Microsoft’s spying, but that’s the reality. It can happen that I can have wrong with certain things (I’m only human, remember that), but Microsoft spying on you is the fact of why I now using Linux as my main operating system since 2015/2016.

• Disable Keylogger in Windows 11 to Stop Microsoft from Collecting Your Data
• Where does Windows 10 save Keyboard input?
• Windows 11 Keylogger: How to Detect & Disable it
• From a ex-employee at Microsoft: You won’t believe what happens when I turn off Windows 10 telemetry! - @Barnacules
• Microsoft’s own privacy policy page (hit “Learn more” under “Personal data we collect” and scroll down to the bullet list for “Interactions”)

There is a lot more proof out there, but I can’t think straight to be able to find them. So if you want to dig some more, by all means, do it.

It’s pretty hard to prove what anyone is doing with closed source code.