The moderator has removed further posts on this thread due to it being perceived as "misrepresenting MYOB". It is my opinion, after having private chat with the moderator, that they want the information removed because it challenges their (very dubious) intent.
I implore everybody who is dissatisfied with MYOB's stance on their secure invoicing system to make a complaint to AFCA, and ideally take their business elsewhere. There are several superior products at a comparable price and so long as THEY don't start to gamble with their customers' private information they are a better option in my opinion.