OP started the personal spat by “preemptively” banning an instance admin from their instance. They can’t be upset when the other admin, who evidently wields a much bigger stick, uses their admin powers in response.
When a mod abuses their power, I don’t really care if another mod abuses their power in retaliation. In fact I think it’s pretty funny.
Of course you can keep money in other currencies lol. Of course you won’t be able to spend it in stores that only accept AUD.
Those currencies also aren’t “higher value” than the Aussie dollar. They’re just different currencies, that’s what exchange rates are for.