It’s just a game for them to popularize code breaking and do some youth recruiting.
Do they really want to do that - considering these talented people might use their code breaking skills against the government? ;-)
There are even sites that teach you about bad modern cryptography, like cryptohack [0] but in general the kind of skills you learn there won't be useful either unless you happen to find a piece of software that rolled their own crypto and did something really dumb (which does happen, occasionally, see the Sony PS3 hack where they used a not-so-random value for crypto, which made it broken)
As Sun Tzu says in The Art of War:
"If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
Please provide a T-F truth table to show that the proposition is false.
Clue: you already have the answer and Sun Tzu has provided three-quarters of it
:-)
Your attitude is equivalent to complaining about a newspaper sudoku being solved by someone early in the day, because “now no one wants to solve it and the paper wasted all that money making it”.
They clearly hoped it would take at least weeks for a full solution, so they could have multiple press events. Or if not, they should have; incompetent either way.
Custom minted coins is not that uncommon in Australia. There's been over 100 of them.
Breaking custom encryption is dead in any country smaller than say, the UK or maybe Canada.
Your comment reminds me of this XKCD: https://xkcd.com/932/