In this case you will receive money of people who used mixer before you. Choose that mode if you
want to save on transaction fees but still remain anonymous and safe
Personally, I wouldn't label it as "safe" if it's going to create a bridge between someone else's previous history and the other user!
This mode allows crypto holders receiving completely clean and anonymous Bitcoins that come from
cryptocurrency exchanges and/or miners. Choose this mode if you want to receive completely clean
coins with lowest available AML score percentage
I had a brief experience with a few analysis software tools in the past and IIRC, "most" exchanges returned with medium-risk ML scores!
- Open statistics: in the mix monitor section you can see chart & latest mixes volumes
If I were you, I'd remove that section completely
[it's not that hard to connect the dots if everything you've listed in there is accurate]!
- Unlimited max amount: Send any amount and mixing will go smoothly even if it's 10 BTC!
A signed message would be nice

For the standard mix mode it's relatively safe, you won't get your coins but will get someone else coins that's the idea