a)So you're claiming that Apple has developed a new Internet communication protocol outside IP TCP/UDP and doesn't use ports, IP addresses, frames or any normal communication system? Because that's what it would take for a firewall to not be able to block communications. And that they have a completely seperate network stack on their OSes that allows this secret communication to bypass any attempt to filter it. You don't know what you're talking about.
b) It's called differential privacy.
https://www.wired.com/2016/06/apples-differential-privacy-collecting-data/
Also: Apple IDs are completely anonymous. You can use any throw-away email address and any fake name to create one. Apple has absolutely no way to know who you are when you create an Apple ID.
c)
https://www.apple.com/legal/privacy/en-ww/
Data in iCloud is end-to-end encrypted, in flight and in storage. The keys are only held by you and any other parties you let access the data. The only shared key encryption is your iOS iCloud backups, which if you enable iCloud syncing contains no personal data.
If you belive Apple is lying about all these public statements then I suggest you hire an attorney and file a suit. Apple is a public company and materially misleading people in such a manner would be all manner of wrong on many levels. When they say your data is yours, they don't want to see it and you are in control of your security... I believe them.