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https://en.wikipedia.org/wiki/Money_launderingMoney laundering is the process of illegally concealing the origin of money, obtained from illicit activities such as drug trafficking, corruption, embezzlement or gambling, by converting it into a legitimate source. It is a crime in many jurisdictions with varying definitions. It is usually a key operation of organized crime.
This is not part of what we are discussing, but why Wikipedia is referring gambling as an illegal activities? If gambling is not legalized in some countries, that does not mean that most gambling do not support gambling. In fact, there are some countries that see bitcoin and other crypto as illegal, but that does not mean cryptocurrencies are not legal. Most countries support bitcoin and many countries are supporting are supporting gambling. Gambling is legal.
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https://en.wikipedia.org/wiki/Cryptocurrency_tumblerA cryptocurrency tumbler or cryptocurrency mixing service[1] is a service that mixes potentially identifiable or "tainted" cryptocurrency funds with others, so as to obscure the trail back to the fund's original source.
That is why some criminals that know about mixers are using it. But the point is that not only criminals are using mixers. Even some people that are using mixers took bitcoin from a platform that is centralized and mix it before sending it to their wallet. Some people do not just use their privacy to play. Some people do not play with privacy because they see it as a way to having full freedom.
Unless you think that every potentially identifiable coin is illegal (which would be false), Bitcoin mixing does not equate with Bitcoin laundering. While it is possible to launder, hereby conceal the origins of money from an illegal activity, it is not a money laundering service, in the same manner that while it is possible to terrorize with the assistance of end-to-end encryption and peer-to-peer protocols, such a messenger is not a terrorism service.
Mixers are not illegal, even when United States have strict rules that mixers can not abide to, United States has never said that they want to ban all mixers. I have not read anything like that also from other countries.
This is what they are doing, they look for any illegal mixing and expose the mixer, but no one is going against mixers in any country.