> Using a mixer has probably 99.9% illegal reasons and 0.1% legitimate uses
Similar to people using paper money or end-to-end encryption really. Nobody needs military-grade encryption or anonymous currency unless they're trying to hide something.
Say I sell software, or SaaS. Then I may need military-grade encryption because I need to sell, a few potential customers (may) need that, and I need to keep my costs down so supplying the latest and greatest cipher to everyone is the right default. It may waste a bit of CPU but it saves the time of the sales and support people, and human time is expensive.
Say I'm going to buy something tomorrow, and I don't like SPoFs. There's a card in my wallet, or maybe two, but if the card reader in the shop is down, that's a SPoF unless I also carry some cash.
That is the fun part, isn't it. Government is now ok with crypto, because it can easily track it. But you try to make it actually not being able to track, booy howdy, it will come down on you like a ton of brick.
Similar to people using paper money or end-to-end encryption really. Nobody needs military-grade encryption or anonymous currency unless they're trying to hide something.