Hi,
I did explain, how it works, look at the FAQ
The software is well testen by our team and some beta testers. I will not make the list of testers public of course.
As I told you, you are right with cloudflare, but you can compare with many other services in the scene. They all use cloudflare and I think, we all have the same opinion on why we use it. You cannot have perfect privacy AND perfect security, so you have to decide, where you can be MOSTLY private and MOSTLY sercure. You should know this, if you are the developer of the page in your signature.

--snip--
In my experience dealing with new mixer operators, a discussion between the mixing operator and myself usually falls in this pattern:

• Mixing owner: Look what a nice mixer i have, look at the nice pictures, look at all the bells and wistles, look at the fancy colors.... I even have moving images to keep you entertained while using my perfect service that is 100% anonymous in every way imaginable!
• Me: hey OP, your mixer uses cloudflare's SSL certificates as a MITM and google analytics
• Mixing owner: everybody is doing it, just have a look at our competitors
• Me: It's not because everybody else is wrong, you have to be too
• Mixing owner: some other lame excuse
• Me: That's a lame excuse (but worded politely)
• Mixing owner: we have a hidden service on tor
• Me: most users wouldn't even know you're using cloudflare, so they won't switch to the tor mirror (if they even know how to do this)
• Mixing owner: I'll put it on my todo list (under the section: "things to do when hell freezes over")

--snip--