@bakerbei They cannot claim it freely because it is now an independent faction rather than “pro-Allies” that ANZAC and Pacific UK can just freely claim. If they want to claim the money islands, they must attack them, which turns only the Dutch territories pro-Axis.
However, if the Axis attack, they become pro-Allies and can then be taken by the Allies. Otherwise, the Dutch cannot be taken unless an attack from either the Axis or Allies happens on one of the Dutch territories.
If Japan attacks the Dutch islands, it does not bring any of the Allies into the war, as it is an independent faction. And the Pacific no longer claims the Dutch islands under their protection.