I agree with this part, but relying Apple is quite far from self-sovereignty compared to many other practical alternatives: not relying on external clouds, GrapheneOS, Linux. By relying on Apple, you not only pay a tax to essentially bribe them to not attack you (perhaps a viable strategy, not too different from taxes to governments), but more importantly you give up the ability to resist without serious compromises (can't have E2EE backups on your own cloud if they said so). This is akin to trying to be paying taxes to the government to get better police coverage, and they decide to ban locks, security cameras, and leaving the walled garden.
The problem with the current computing security paradigm is that it puts too much trust in entities that do not deserve it, because the entities are simply too powerful and do not suffer consequences when they break that trust.