@John *******
I'm repeating. It's NOT fraud to rent a ticket to show immigrations upon entry. Having the ticket at the point of entry is required, using it is not. If you claim it is, you are simply wrong. By the same reasoning it is also NOT fraud to have a cheap ticket to a neighboring country that you plan to just ignore. If you say it is, you are false.
If you say it's unethical, I don't understand on which basis it would be. Thailand requires visitors to leave on time, and what 'on time' is, is open for change. That should be enough. It is also not forbidden, *** knows how on earth you think otherwise, to book a suitable exit ticket within that allowed date while you're here. So the only unethical thing here, if any, is to require visitors to have exit travel arranged within a fixed date x when they enter. It makes no sense at all. But what DOES make sense is it is (luckily) not even worse. You ARE allowed to deviate from the plans after you entered.
Your claims are absolute bogus, without exception. It's all nonsense. But as you seem convinced, I invite you to post a source.