PRISM covered communications through U.S. company’s servers. It was not a magic back door giving them access to your device’s local data, and even if you did believe that it was the answer would be not using a phone. A major intelligence agency does not need you to have a Google account so they can spy on you.

Forest for the tree.

Google and Apple are both heavily invested in ads (apple made 4.7 billion from ads in 2022), they have a track record of exfiltrating your data (remember contractors listening to your siri recordings?), of lying to the customers (remember the home button scandal on iPhone?), have control over a device that have your whole life yet runs partially on code you can't evaluate.

Trusting those people makes no sense at all. You have a business relationship with them, that's it.

It’s interesting how each time you say something which isn’t accurate you try to distract by changing the topic.