Unfortunately, some people learn the hard way, but the only positive thing is that fortunately the amount lost does not mean too much to you. Everything that is in any way related to finances, and especially to crypto, you need to check at least a few times before you really start using it. Crypto is unfortunately among other things ideal for a variety of scams, and mixers are very popular way to scam people.
What angers me the most is that such fraudsters get their money in a very simple and banal way, with almost no chance of being caught and prosecuted. We can only hope that justice will one day reach them, one way or another.