And what prevents governments or institutions mass brute-force decrypting that data if they get their hands on it?
Why on earth isn't Apple building their own datacenters if they care so much about privacy and security? They have enough money to bypass AWS, GCP and Azure. Most companies actually choose cloud hosting services to save money, because they don't have enough cash on hand to build their own datacenters.
Apple probably is building data centers, but it takes both time and money.
http://www.datacenterdynamics.com/c...d-2b-data-center-in-arizona/93157.fullarticle
https://www.cnbc.com/2018/01/17/apple-to-boost-data-center-capex-by-10-billion.html
https://www.apple.com/newsroom/2017/08/apples-next-us-data-center-will-be-built-in-iowa/