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The positive idea of anonymity has led to the appearence of a large number of fraudsters and scammers who, thanks to anonymity, avoid the punishment.
Most cryptocurrencies are not anonymous. You can find a user by transactions that connected to a crypto exchange or exchange for material values. Therefore, there are mixers for
BTC. In addition, it is difficult to prove the fact of scam.
That is why many people do not use exchanges with KYC procedures and use mixers to mix up transactions. Bitcoin mixers are rather popular.