You can buy the shares that are offered at an exchange if you are allowed to buy at this exchange by your bank.
You are using a bank as broker/dealer. The bank is a sophisticated investor and can buy whatever security or finanical lottery ticket it wants.
However, it can not sell you unregistered securities unless you are a sophisticated investor.
I never heard that, if you are allowed for one exchange, you cannot buy any share offered there. Maybe its because the bank you work with is the identity owning the shares. So that you arent exposed as a foreigner. If thats the case then a bitcoin bank could circumvent these restrictions too.
I imagine a bank could theoretically register its own security and act as a pass through. But thats not circumventing the law, its implementing it. And im not even sure they are allowed to open their investors indirectly to the risk of unregistered securities.
Otherwise, lets say Austria is making a law that Google has to apply to their rules if an austrian owns a google share then Google has to follow everything Austria wants to?
No. An Austrian owning a share of google doesnt mean google is soliciting investments on the Austrian capital market.
It would make sense if google would try to offer their shares in an austrian stock exchange, if there is one.
Exactly. And selling securities over the internet without verifying the identity and nationality of the investors, is put on the same footing for obvious reasons.