Why would Apple block something just because they finally added it as a native feature. Shouldn't users be allowed choice? Imagine Windows blocking third party task managers or Android blocking third-party calculators.
When a small number of people do this it's fine I think but Apple had an issue when 1000s started doing it.
Question - why couldn't they publish on app store instead?
Apple doesn't allow apps that do the same thing as features they release / plan to release.
Flux became popular, Apple ripped it off, and blocked them from competing in the App Store. Just another data point for the antitrust lawsuit.
https://www.pcmag.com/news/flux-to-apple-let-our-blue-light-...