I think this is somewhat unfair to Apple.  After all, the *ONLY* reason why Apple is pickish about these things is because they feel the heat from the Biggest of all Brothers on this planet: the totalitarian united states of america federal government.   Otherwise they wouldn't bother.
That said, Apple doesn't come and raid your house if you install something on a computer.  The only thing they do is to sell products that can only use their store, and to decide themselves what they want to put in their store or not.  That is their good right.   The problem with Apple stuff is not that Apple can decide what they put in their own store (nothing sounds more normal than that).  The problem is that i-things only work with Apple store stuff.  It is a closed system.

If you buy an intel computer, you can put linux on it, and you're free.  But even windows allows you to install just any software you like.  Android too.  So if you intend to use your device the way YOU intend to use it, and not the way Apple is telling you to use it, you shouldn't buy Apple stuff.  On the other hand, if you want to stick to the Apple experience as Apple decides it, then by all means, buy i-stuff.  This is why I said that probably, most Apple customers are not interested in crypto.  If you're interested in crypto, you're not going to lock yourself up in a closed system.

It is true that even android devices are more tied to Google, than intel machines are linked to, say, microsoft, because most android devices are so different.  There's no non-tweaked standard install of an Android derivative that just works on most devices, like gnu/linux runs "out of the box" on most different intel machines.
But at least, with some work, you can get a version of, say, Cyanogenmod on your android device, and you're free.