It's pretty obvious. They're not disallowing it. They are removing the integration with the home screen so that it will run in third party browsers. That limits it to the smallest common API surface which is "open link". Everything else was a luxury.
I don't think you work in IT if you haven't had an infested windows, android or macOS box before. Hell I just spent the other day cleaning my father's Mac out of two VPN turds fighting with each other he installed after watching crap on YouTube. My daughter's windows machine got destroyed by unsigned crap from a Sims mod. You just don't get that on iOS apart from the odd calendar subscription turd.
As for spotify, they use their own subscription system, not the app store.
I don't think you work in IT if you haven't had an infested windows, android or macOS box before. Hell I just spent the other day cleaning my father's Mac out of two VPN turds fighting with each other he installed after watching crap on YouTube. My daughter's windows machine got destroyed by unsigned crap from a Sims mod. You just don't get that on iOS apart from the odd calendar subscription turd.
As for spotify, they use their own subscription system, not the app store.