MNW's promise was that he will give 100% ROI if pirate defaults. When pirate officially defaulted, he has broken his promise.
Compare to a bunch of tokens / IOUs which has zero terms. No contract unlike MNW, end of story. If I said that I would redeem those for actual BTC, and did not specify a time, then it would have to be a reasonable amount of time.
TF may not meet the definition of "scammer" for the forum.
I have other words to describe his actions and the person that would take those actions.
None of them are suitable for print.