I wish it was, but no, selling a computer system with Windows installed is consensual, either by explicit customer request or by the customer agreeing to a sale offer as advertised.
No one gets tricked into approval (here: buying) because every customer is able to request a different or no OS, or to reject an immutable sale offer; except if you think that not knowing what an operating system is and what it implies constitutes a trick, but that does not meet the legal definition.
Selling Windows by default with every computer is now illegal in Germany then?