This would be the worst idea for a mixer
Nobody should know this for safety reasons.
I also understand that this is very difficult to do. But if Coinomize.biz only records number of users and total amount of BTC mixed, and does not store users' personal data (IP, addresses, amount of BTC), then users will not be affected. For example, we know the number of oranges a store sells in a day, but we don't know the details of the identity and quantity of oranges each customer has bought.
However, this is just my opinion. Coinomize.biz has its own philosophy and operating principles to ensure that users feel comfortable and safe when mixing BTC on the platform. The Coinomize.biz team knows what is best and most suitable for the needs of customers
