It's the CCP's fault.
They can't even honour the HK handover agreement or international judgements on territorial claims in the South China Sea. I feel sorry for the mainlanders who can't even protest or even hear about it.
Apple on the other hand are a risk-averse profit-making business that doesn't need to care about sides in politics, only power. They will happily nix any app that makes them uncomfortable including via diplomatic pressure from a key supplier and customer market. Just like YT will de-monetize videos dealing with awkward subjects. These businesses are not here to serve people, promote regime change or help rock the boat.
There shouldn't be a monopoly on app stores.