Sure, but if you fully believe that the platform is untrustworthy, that seems like the ultimate dealbreaker for someone who is concerned about their data privacy. It's the juxtaposition of "I don't trust this platform at all" and "I put my data that must remain private on it" that I don't understand.
Trusthworthy has two meanings here. I trust that Apple does have no intention to look into my private data. I think they'd rather have no way of getting into it while providing the services as that minimizes their liability. In that sense they are trustworthy. But you might not trust them to be secure enough to store that data. Or maybe it has nothing to do with Apple, maybe you don't want your keychain in the "cloud" ever. I trust Apple does not intend to be nefarious, I don't trust (the security of) any "cloud" to store sensitive data. Those are not conflicting positions to be in.
