what?
how does one define "taint"?

the whole point is that taint is an arbitrary Chainanal and CEX definition we have no control over.
its a byproduct of a transparent ledger.

therefore two UTXOS with different histories are nonfungible by definition.

1 btc != 1 btc 

 In my definition a tainted coin is a coin is one that’s been moved after minting 

 lol 
well its a good thing we dont have to worry too much about your definition  

 Yes