What taxes or subsidies are you talking about?? The Halberstadt project is funded on voluntary donations by people who want to see it happen.

It’s not clear what’s making you angry about one obscure performance of an obscure piece of music, but you might have more in common with Cage than you imagine. Cage described himself as an anarchist, and pieces like 4’33” are, in part, a commentary on the rules of music that make fun of establishment. Maybe he’s saying the same thing you are about the emperor’s clothes.