What kind of attacks did you exactly make? I'm keen to know them and understand all of them in a much better way if you could elaborate it well. Also, how can you consider the mentioned mixer services to be centralized?

You may find it stupid but I wish to ask one more question here, that when you're able to attack these services (don't know exactly the type of attack, but still a query in my mind), weren't you able to fetch transactions done by XMR and Dash users? It'd be a threat to these alts if you or any dev will be able to fetch the real transactions among the mixed ones as well as I believe you already are a fear to all of us who use these services because if this is actually true, what's the meaning for anyone to use a mixer?