Your system asks for reduced motion, so VFX-JS draws nothing. Demos on this site show plain HTML.
Type
DatamoshView
effects/src/datamosh.ts:296 ↗import type { DatamoshView } from "@vfx-js/effects";Stage routed to the canvas; non-output views are for debugging.
type DatamoshView = "output" | "motion" | "residual" | "current" | "previous"