Like WasabiWallet, Mixtum.io merely accepted the trade-offs to protect their company from the tyrannical nature of the government, AND protect their users from having their UTXOs mixed with "tainted outputs". YOU should understand WHY they did it most of all.
You don't protect your users by collecting their data and taking their coins. Bitcoiners deserve better than being scammed by mixing sites. They deserve open source software that never requires you to trust anyone: Wasabi Wallet.