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'Money is always created by the state and must therefore be regulated by the state'
Uhm, what? The only way the state is a special actor in all of this, is that it takes the liberty to rewrite monetary contracts at its whims.
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Open your eyes. All relevant money systems in the world today exist as creations of the state, under the rules of the state.
I agree with you that it is, in principle, possible for a money system to be created by somebody other than a state. Clearly, there are some examples of this in history, and it is attempted occasionally without too much success in the sense of achieved relevance (see e.g. Bitcoin). And that's the key point here. Those other money system remain too small to be of relevance. So if you want to pretend that money is not created by the state, a productive discussion with you is pretty much impossible. One could say that you have to accept the fact that the Emperor has no clothes.
By the way: MMT is slowly but surely gaining traction among other economists. Here's an interesting paper by someone who basically agrees in all points, but just thinks the message should be toned down. (There is one minor point where he does disagree, which I believe to be a mistake in how he accounts for net financial assets. But I digress.)