Right but my point is you can _already_ do this in javascript, but people largely don't. The playing field doesn't change with WASM. If some WASM code creates a

Right but my point is you can _already_ do this in javascript, but people largely don't. The playing field doesn't change with WASM. If some WASM code creates a canvas-based ad, we can use the usual tactics to block it (delete the element by ID/selector/etc or block that particular WASM payload)