How is Hybridmixer a ponzi? There's no fixed claims of return on their site.
the correct term for it is scam, because they are running a fake mixer which you can read the explanation in this topic and also in this feedback on the last page of their topic
https://bitcointalk.org/index.php?topic=1589308.msg15972805#msg15972805and also it is clear now since the owner has ran away and there is no response from him.