A locked door with a key in the lock is not really locked. As far as a court order is concerned, if they hold the keys they are available with the "encrypted" data".
Apple already (can and do) provide any and all data they hold, including decrypting data they hold the decryption keys for in response to a court order worldwide.
> A locked door with a key in the lock is not really locked.
A physical key sitting in a lock? Anyone walking by can turn it. Done. That's not what's happening with iCloud data.
Apple's decryption key isn't sitting there for the turning. It's stored in access-controlled systems and requires deliberate action and legal process to use. An employee or passerby can't just stroll by and "turn the key."
If you want the only copy of the key to your digital safety deposit box where you store all your stuff, thankfully there is Advanced Data Protection.
> As far as a court order is concerned
All service providers you use will provide data in response to lawful requests.
Apple already (can and do) provide any and all data they hold, including decrypting data they hold the decryption keys for in response to a court order worldwide.