China limits all foreign companies from accessing it's market. The true reason is to provide a safe heaven to allow local companies develop it's own technology and capability before killed off by foreign companies. During 80s when China is start to open up the market, China has literally no private enterprises with good capability on it's own. Foreign companies from US and Europe have too advanced of technology and scale simply because they have been developing much longer while China was being war ravaged. These companies would easily take over the china market and kill any local enterprises. Look at the affect of the ban, China now as pretty good technology on it's own and local companies with the scale that can compete with foreign companies. Foreign companies now entering China find difficulty partly because of the regulatory environment but also because of local competition is much stronger. I would argue that Apple sales decrease in China is not mainly from regulation but competition from Huawei xiaomi and oppo. Now contrast this with Europe and Canada, especially in the tech market, no one has home grown technology companies that are big enough to compete with the US. Many homegrown companies went away because of it cannot compete with the US. Is would surely damage local economy right? I think the advantages and disadvantages to free market must be carefully balanced.
It is also duplicitous when China closes its market off. Insofar as the point that it's cutting off foreign companies is so that it can filter in the control it has over it's population. You try to dance around that fact which is why you need to reconsider your angle on all of your comments. The actual truth is that this is a move necessary on a multitude of facets: Chinese spying, Nearly cutting off American technology supplies to China implying a HUGE blockage of intellectual property as well as devices and chips, Starving the state proxy Huawei, Creates a dialogue of concessions China could make, etc. This has created a chokepoint where American interests can act more nobley to circumvent a totalitarian state. Your slant could read as anti-American but more accurately I think it is more pro-Chinese or perhaps you are just missing the bigger picture.