They both have the same schtick - create a walled garden then restrict access.

It results in predictable outcomes:

* products that are beautiful and in some ways without peer

* key parts/issues are only addressable through their service channel

* exclusivity of membership for better/worse.

* higher profit margins and healthy overall profit despite lower market share

They can have more than one business reason. And the PR side of things has been critical of late.

Your Apple will still turn on if you create a Franken-book (as long as you can get drivers).

They won’t sell you spare parts, but if you find some, you’re ok. This does prop up resale values to some degree (for parts donors).

Although Apple is going down the Tesla road slowly (the fingerprint reader is married to the logic board on newer models).