Because it is just that the EU wants the Dutch to finance Southern Europe. Nexit: Dutch ‘only tolerated EU when UK was key member’
THE EU's relationship with the Netherlands was thrown into sharp focus following Brexit and the coronavirus pandemic, triggering fears that the member state may leave the bloc
As for the financing...
The French President Emmanuel Macron told the Financial Times that the bloc’s fate effectively rested on Germany and the Netherlands agreeing to “financial transfers and solidarity” to dodge populism in the major member states.
That is paying off the debts of states that can't make ends meet.
Click thru, there is much more, from history of the European Economic Community, to Brexit and beyond.