The Channel Islands are already a tax haven. Have been for a long while.
Certain Caribbean members of the Commonwealth of Nations are also longstanding and well known tax havens.
The Republic of Ireland is, to a certain extent, a tax haven.
Each countries’ tax laws stand alone, as do the tax havens.
Germany should mind their own business.
The Germans can’t mind their own business. They seem to have a deep seated need to tell others what to do.