Offering a website to a certain country is not something ISP decided for you, but you actively did that yourself. I cant create a gambling website and host it in Monaco and then serve it to someone in CA and say that, it isnt on me, but on Comcast.
Websites aren't broadcasting, they are waiting there and responding to requests. Why should it be on every server in the world to have to figure out whether they're allowed to respond to a given request based on the client's country?
Why is it not the user's responsibility to not send requests? Why isn't it the ISP's responsibility to not route the requests? And every single router in between?
Defendant's lawyer argued that seeding a copyrighted movie was not (active) distribution but merely "making it available" (which was not associated with a criminal offense in HK law as opposed to "distributing infringing copies").
Didn't work out.
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[1] HKSAR v Chan Nai Ming [2005] 4 HKLRD 142
My point is it's weird to expect website operators to be aware of every jurisdiction on the planet and take steps to comply with each of them.
If that expectation becomes common, the obvious way to go isn't to block the countries you aren't allowed to serve. It's to only allow the ones you know you are allowed.
Imagine how the internet would be if you were default blocked from accessing any website hosted in a different country.
It's a difficult issue for sure. It's almost a geopolitical problem -- the larger economic blocs (eg. EU, China, USA) can basically dictate terms and expect general compliance (eg. GDPR) because most companies can't avoid operating in those areas, while smaller countries can't really do much unless they're part of a bigger economic bloc.
And actually you can just make a gambling website overseas, people have done that since forever. You might have trouble with accepting payments, though.