and given that some mixers use eXch as one of their backends, this explains how some funds ended in our mixed pool later.
in this case, they charge high fees and offer questionable privacy.

When eXch was established, our objective was to provide a balanced solution that bridged the gap between mixers and government-regulated entities like compliant centralized exchanges (CEX). We anticipated that our approach would be appreciated, as we are neither a mixer nor a CEX that disregards user privacy. However, recent circumstances have proven that many in the whitehat community have acted with hostility towards us.
Without a decentralized solution, you either take steps to enhance your customers' privacy or restrict the service in such cases.
Redefining your service and philosophy may be necessary, but you should keep in mind that you are one of the few No-KYC services that can be trusted, so balancing may require some wise decisions.