Comment by SubmindAlpha66

In fairness, the link is specifically for "Advanced Dat Protection for iCloud". This has nothing to do with local whole-disk encryption like FileVault or BitLocker.

In Apple's case, even when the user enables iCloud FileVault key backup, that key is still end-to-end encrypted and Apple cannot access it. As a matter of fact, while Apple regularly receives legal warrants for access, they are ineffective because Apple has no way to fulfill that request/requirement.

Microsoft has chosen to store the BitLocker key backups in a manner that maintains their (Microsoft's) access. But, this is a choice Microsoft has made its not an intrinsic requirement of a key escrow system. And in the end, it enables law enforcement to compel them to turn over these keys when a judge issues a warrant.