There is no other ecosystem that will provide easy E2EE in the cloud, that’s reason enough for the vast majority of users who are just sick of breaches because of pure sysadmin incompetence.

There are plenty of examples in every Apple service or even their accessories (i.e. wireless keyboard encryption). FaceTime is hardened from even theoretical attacks that could probably only be performed by 5 eyes like transcribing E2EE calls based on bandwidth use (FaceTime has built mitigations around this attack vector).

iPhone security is very good, better than, say, your desktop even though you don't carry your desktop everywhere you go. (Some Android security is also very good, depends on the hardware though.)