They can act on any process, however this one turned the whole BB econony upside down.
this one lead to a switch, the suggested thing here turned the economy upside down because the value of the players will change instantly with the change - and not through the process that teams don't earn this massiv amounts of money anymore. When free agents was introduced, the prices didn't collapsed to 20% of it, they got slowly(or not so slowly but not instantly), which wasn't only the reason of the free agent as i said the raising salaries had a bigger impact because you haven't those astronomic income anymore if i pay now 1,5 mio i need more time to get the needed money then when i spent 5 Mio in the past days.
So your ABBL winner, make a strategic long term decision, which gave him an advantage about his opponents in the future which lead to his championship. Maybe you could discuss if this give up strategy to powerful, but this will need another thread because you could still earn 500k+ each week in the premier devision and this is a high quality player every 4 weeks.