The only thing I was kinda wondering about (other than its amazing this service has been around since 2016) is that I find no information in the FAQ or in this thread on how the Bitcoin are mixed.
 
As I understand it, they are using other customers funds and mixing them around and sending them right back. But would this not mean you could get Bitcoin from ransomware or a hack or even something worse than that to your address? I mean maybe not directly but with just like 2-3 txs (or a few more, maybe) in between them?

Or is there some deep/clever mixing going on that I am just not aware of?

I would also love to hear OP how he sees the future now with what just happen to Chipmixer but maybe this is the wrong place for that.