i think that day is passing. Anti-trust looms, and they are opening up more. See the PWA and notifications release in most recent iOS. More to come I imagine.
Discussion
Yet they still are able to get telegram channels blocked to remain in App Store
That's possible. Maybe they'll loosen the reins a bit moving forward. We also saw a rumor that Apple was going to allow third party apps stores or something similar to sideloading, like Android, in the future.
Ironic that regulators are helping to save a company from itself.
I think we'll see side loading and third party rendering engines this year. Maybe RCS.