When money changes hands, it can get “poisoned” and this causes problems for future users. That's why fungibility, like in Monero, is crucial—it keeps all money equal and safe to use.
Learnt about "dirty" bitcoins and hoe traceback works. I mean, public ledger and all. This is where Monero fucks nostr:nevent1qqsg6k6k4s5ups37weus00j5favzq22l0c77lycggj9g3ckwl3x3elqprpmhxue69uhkummnw3ezuendwsh8w6t69e3xj730qgsq6l8v48sqpec3uf3mc99zy94twjtg485s86azzjn3gvq2mm095gqrqsqqqqqpj2cfr7