That is good in theory. Reality, anyone you engage with that uses an Apple device has leaked your content / information to Apple. High confidence that Apple could easily build profiles on people that do not use their devices via this indirect action of having to communicate with Apple devices owners.
That statement above also applies to Google. There is now way not prevent indirect data sharing with Apple or Google.
Yes, if your thread model includes the provider of your operating system, then you cannot win. It's really that simple. You fundamentally need to trust your operating system because it can just lie to you
Not unless your entire stack down to the bare silicon is also FLOSS, and the community is able to verify.
There is a lot of navel gazing in these comments about "the perfect solution", but we all know (or should know) that perfect is the enemy of good enough.
Depending on your social circle such exposure is not so hard to avoid. Maybe you cannot avoid it entirely but it may be low enough that it doesn't matter. I have older relatives with basically zero online presence.
That statement above also applies to Google. There is now way not prevent indirect data sharing with Apple or Google.