Yes, security should always be implemented by technical means by the platform. Those hoping that alt-app stores means a complete free for all will be disappoint

Yes, security should always be implemented by technical means by the platform. Those hoping that alt-app stores means a complete free for all will be disappointed. But many things just cannot be restricted just by technical means, and instead relies on policy, and the threat of Apple kicking you off the platform, to enforce restrictions. A trivial example is the review prompts. It's policy that you must use the standard iOS APIs to trigger (which limits the frequency it's shown to the user). An app technically could implement their own UI (and im sure some still slip through), and there's no real way to prevent this, but being against the rules carries risks.