Well, time to see if that's the case with my local account Win11 PC. Also going to look up a guide on how to stop the key from being shared to MicroDaft and how to change the key.

Edit: It appears that Bitlocker is only on Win10/11 Pro and above, Home editions use Device Encryption instead. Device Encryption is a simplified version of Bitlocker. The key is only uploaded if you use a Microsoft account for login.

Still going to check anyway.