I myself used to Mix BTC but only used Clearnet instead of Tor. I understand that we have to trade speed for better anonymity on the Internet, but think Mixer has secured that for my BTC. Maybe Tor helps mask my IP but that's not too important for me personally, maybe it's a problem for others.
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I value maximum privacy, and that definitely includes using the onion version, because regardless of the trust you have in the mixer, past cases have shown that if the authorities seize them, they find a lot more than what they should find. Maybe you are not doing anything illegal and you have no problem with the mixer or someone else knowing from which IP address the Bitcoin came, but if you are already mixing BTC, why not do it completely privately?
Well, I do respect your personal observation and you may be right with whatever you said, but I'm very sure that those who mix huge amounts may prefer tor version because they want best privacy and they also know about the Tor.
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You're probably right, although sometimes we come across cases of people who had a lot of BTC and lost it in a rather bizarre way, so I wouldn't say that those who have more BTC are those who value their privacy more. I think that the feeling for privacy is not something that is closely related to BTC, but still depends on how much someone values privacy in their life.
There are people who do not allow anyone to peek into their private life, and there are those who live their private life without any problems in front of the cameras in various reality shows.