Here we go again...
Let me explain how Chinese people think about HK, since none of them ever seem to explain it on a site like this.
Imagine you are a middle class American. Maybe you are but if not, just imagine, tech city on the east or west coast. You're pretty invested in being an American, skin in the game, manifest destiny etc. Very good. They call this tianxia by the way, basically Chinese manifest destiny.
Let's say one day some stupid little state that you don't care about and vaguely resent decides it wants to secede, wants all these rights others don't have, wants to be able to marry its cousins or make nukes at home or whatever. Alabama, say. Alabama wants to secede and they have some demonstrations. You think: "hahahaha no"
They keep demonstrating. The larger country talks about sending in the national guard or something. "Good, who do they think they are" you say.
Some alabamans post an app on the app store so they can avoid the national guard. It's linked to secessionist alabamans avoiding and even attacking the guard. Apple takes it down, then puts it back up, then takes it back down
"Good" you say.
This is how, conservatively, 90%+ of Chinese think. For them, HK is a tiny little past-glory city who thinks it's better than everyone else and is just causing trouble. They will eventually be brought into line, hopefully without too much bloodshed, just like Alabama. It's not really malicious. It's a province of China - it's misbehaving, and it will be brought into line in due course. Nothing more, nothing less.
I expect someone explained these truths to Apple, they saw the futility of taking some hopeless, simplistic, you-don't-even-live-here side, decided this was not the hill they wanted to die on, and pulled the app. I don't blame them.
I'd like to note that I do not support the Chinese Govt in any way and think the world would be a better place with an independent, democratic HK - a city I genuinely love. The Chinese have about as much chance agreeing with that as Americans would about an independent Alabama. Not going to happen.