Many said that Mixer users are not all criminal, but honestly there is no way to know if they are or they are not, because nothing is opened to the public when it comes to mixers, it's why the government are pissed with mixers and believe that it's a good place for moving illegal funds for illegal activities, mixer isn't made for someone like me, as I don't see why I will want to hide my transaction, when the money isn't dirty money.
Mixers do not pay taxes, no license even though they are dealing with money so it is an unregulated industry, and since it unregulated it's free for all good users and bad actors like hackers and scammers can avail of their service, and the authorities will shut any mixers that deals with scammers and mixers cannot do anything about it since they have no parameters to make their platform safe from bad actors.
And I don't think mixers will ask for KYC from their clients.
If one mixer changes their terms and asks for KYC to keep their platform safe, I don't think all the other mixers will follow their lead, they are going to lose clients who want to anonymize their transactions.
Well, the casinos are not illegal nor they are declared illegal by the government and in many parts of the world running or playing at online or offline casinos is not considered a bad practice, so they are safe.
Maybe we should not compare the mixers with casinos, as both are different in terms of everything including the use cases. Also, if mixers start to ask for the KYC, then the whole purpose of mixing the coins goes in vain as we need to remain anonymous and do not want to link the coins and remove the traces and if we have done the KYC, then mixers lose their concept of mixing the coins.