There was a story here the other day, bitlocker keys stored in your Microsoft account will be handed over.
Which windows does by default and makes it hard to turn off
This has been known for a while, though I don't know if your typical layperson was aware until recently. People need to remember that any access a company has to a device, so does LE with a warrant. Even moreso once you get into federal resources and FISA courts.
Bitlocker isn't secure, for several reasons, that I won't get into on here.