This argument feels disingenuous. Everything ordinals do is attach optional extra information to certain satoshis which makes them more valuable in the eyes of some. All wallets that do not support ordinals (all of them apart from the official ord wallet that kicked them off) do not care about this new kind of "taint".

Apart from that, you can already follow the tracks onchain to figure out where certain coins came from. Ordinals just make that more visible to average users