Have you ever heard the phrase ‘walled garden?’ Apple makes their products to work very well together and with anyone else’s products they work in a way that is intentionally functional, so they can’t be said to be actually blocking interoperability, but mediocre, so you’ll get a better experience with their products. If you care about price, you aren’t using apple anyway, so it milks their price-insensitive customer base for more money while only really bothering the people who wouldn’t buy them anyway.