I worked for Spotify, and apple did all kind of hoopla to delay/deny the iOS updates....
My favorite one: If you did tap at one of the support/help tabs, it would open a webpage, which contained the support text, and the app got rejected, because after about THREE links, that would lead to the homepage, and there was a premium offer, and you can't have it.....
They kept denying updates for reasons like that....
"Coincidentally" they released their streaming service that month....
That's extremely anti-competitive..... and it wasn't done for the benefit of the user, but for the benefit of Apple only. When a user buys a phone, they have a reasonable expectations that other apps would work, and you will not be forced to use apple only services (directly or indirectly).
I.e. they are false advertising their phones.....