I think they deserve to be kicked out or face the full force of pubishment too..
Thailand has the right to self determination and to control its own borders, immigration and tax policies, we have the right to comply or leave.
We dont have the moral right to lie and cheat to abuse the (generally pretty simple and easy to comply with) systems they offer because 'we dont want to' while boasting of the power of our passports. Its things like this which really get under Thai nationals skin and in turn make things harder for the rest of us.
Simple really.
Plus what we are debating is what the rules are, anyone can lie and cheat, its pretending the rules are something they are not, like 'no taxes are due if you pay somewhere else' or 'Oz super isnt taxable in Thailand' confuses people when what your actually saying is 'I intend to lie so I dont pay taxes in Thailand'. Those are not the same thing.
So your plan is fraud.. OK at least your open and clear about it.
I would suggest Thailand has every right to not want people whose plan is to knowingly lie and defraud the country to come here. You know the rules, go where the rules suit your needs.
You are free to believe in what you wish to believe in.. Consumption taxes being superior to income taxes, the benefits of attracting high net worth millionaires, etc etc..
But we are not free to invent our own reality.. The rules that Thailand makes are up to them, we (those of us lucky enough to have powerful passports) are free to choose to comply or to leave, what is not really morally right is to want to enjoy the hospitality of a host country and purposefully lie and abuse that hospitality when the rules are clearly stated in advance.
"if you DON'T even have a single bank account here, you couldn't be taxed, as the government won't have any records of you either getting income"
It's not about what they can see, it's about what the law is. That attitude, from people desiring long stay visas to work and line here, frankly stinks.