>someone built a beautiful walled garden where people are walking nicelyJust because you build something nice doesn't mean you can do whatever you want with it. You're still bound by the rules of the state where you operate and earn revenue.
If I build a nice house for me I still have tones of regulation how I can build it and what I can do with it, including activities inside. For example, I can't fire guns(EU) or cook meth in my house, even though it's my property and I pay taxes on it.
Tech companies for some reason think that just because they don't build with brick and mortar but with bytes instead, then somehow the local laws don't apply to them. So just because you built a nice walled garden, the state will want to make sure you don't get to screw over everyone who enters there.