Such a generous country, based on "word" giving nominations, and at first month, people try to dump their words, then everybody is surprised why Australia is tightening immigration laws.
I intended to apply thru 190, then I was concerned whether I can fulfill my commitment, and waited till the point when I can secure 189.
My view is, give a good start, Australia does not have any obligation at all to take you, and honoring the word should be above, if I were you, I would have tried 6 months, made 100 job applications, if no response, then I'd have moved applying to other states, if I'd have gotten a response, then I'd have stated to state the circumstances. But under no conditions to move to other state after 1 month, this shows that you were never genuine...
With my full respect, this is very frustrating, especially having lots of genuine people which want to immigrate.