Will China allow this? AFAIK Hong Kong has special type of government that gives them a little bit of separation from the Mainland China. I didn't read the full scooe of this exchange but I doubt China will permit this exchange to accept people form the Mainland. Correct me if I'm wrong because it's nonsense that they still ban all form of cryptocurrency use on their mainland and allow their people to use Hong Kong to bypass their law.
china do not want to separate hongkong from china. if china started to say that only hongkong citizens can do X and mainlanders cant. then that forms a separation.. which china never wants.
yes they have separate laws but mainlanders can use the services of hongkong
think of it like canada and US have different laws. but that does not stop someone in canada from buying produce from the US, nor does it stop a canadian from using a US exchange
even things like. if a US state bans gambling. it does not stop a US citizen from going across state lines to then gamble in a gambling allowed state. the citizen wont get arrested when they return home
another for instance.. the US currently is not allowing a spot ETF.. yet europe and australia do have spot ETF's which US citizens can use