They already have. Apple complies with hundreds of thousands of federal data requests every year, they send messages back to HQ every time you launch an app, they help China hunt down religious minorities, they give the FBI access to iCloud data without a warrant, they collect a list of unique identifiers for every photo on your phone, and at the end of the day you're still vulnerable to exploits like Pegasus and RCE through iMessage image decoders.

If you think Apple hasn't violated that promise, you must have an extremely selective definition of privacy.