Any evidence that a significant fraction come from those? It'd be incredibly easy to prove if that's the case and I only ever see guesswork rather than Blockcha

Any evidence that a significant fraction come from those? It'd be incredibly easy to prove if that's the case and I only ever see guesswork rather than Blockchain analysis behind those claims. Moreover, most of the big NFT investors seem to have a long history and as far as I can tell are often just collectors who are already rich from crypto.