It’s effectively bundled with Apple hardware (which also dramatically lowers their development costs; they don’t support anything they don’t ship and are perfectly willing to abandon hardware once it no longer supports the level of hardware features they feel the new OS version needs). I’m not sure it’s that different.
Android is free (maybe? Do phone manufacturers pay for Google play branding?), but they make their money by having the lions share of software going through their storefront. Microsoft is never going to do that with Windows.