But... your analogy is even worse, I think. Apple doesn't "kidnap" people. You willingly opt-in to the "walled garden" ecosystem. It isn't forced on you in any way at all.

It's more like contracting a security firm to keep your stuff safe. They promise they'll do their best, and in exchange you give them some money and acknowledge that they don't have to explain to you how it works. If you find a flaw in their security system, you can either (a) sell it to somebody, thus compromising all of the firm's clients (including yourself), (b) report it to the company so they can fix it, or (c) keep it secret for some reason. I would always choose (b). I find (c) to be in poor taste, but not appalling by any means. (a) is, in my opinion, never an acceptable option.