the concept of a good or bad coin is a societal, so Monero is just a 'bad' coin, even if it is private, or no?
The OPs original topic was fungibility meaning any given coin is indistiguishable from another. With Bitcoin you can split into "clean" and "tainted" coins. With Monero either *all coins are clean* or *all coins are tainted*. You can't pick and choose like Bitcoin.
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