If you don't trust Google and Apple when they say their API does what they say it does, then you can't use an iPhone or Android phone.

I understand that people are conscious about these things but what I don't understand is how people say "oh I'd never run an app using an API from google/apple, they have a horrible track record" and then carry a phone in their pocket with an OS from either Google or Apple, where those companies can basically do whatever they want. If you carry such a phone you already trust them. If this API does what it says it does (basically exchange random numbers) then how is that worse than what you already trust your phone to do?