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This Letter of Guarantee is useless I think if you are talking about the Letter when you deposited.
BitcoinGirl.Club I completely agree with both of your points. Regarding their withdrawal method, it seems like they wanted to emulate ChipMixer, although it seems to me that CM did it slightly better.
You are also right about the Letter of Guarantee. Luckily I have both, but it wouldn't have been like that if I hadn't requested a withdrawal and the balance on my note disappeared.
Point is, I will not trust a mixing service to hold my coin for long days. With Chipmixer they provided me the withdrawal private keys as soon as one confirmation was made of my deposit. When the private keys are in my possession, it was my responsibility to secure any coin on the keys, they never encouraged me to hold the coins in those private keys. I don't see anything for WWM that they wanted to emulate with Chipmixer. They wanted to take the empty space of Chipmixer and the hype they created was with the unexpected very high paying signature campaign.
Look at it from the business perspective:
[1.] Is the business making enough money? No.
[2.] What is the ratio of business and marketing expense? Very abnormal ratio of expense than income.
If I have a thousand btc then may be I can afford it, question is do they have a thousand btc? All we saw were few btc on that 2 of 3 address and $40k deposited to minerjones. I really hope I am wrong about them and they will come back to operate normal like before.
One very important concern in the business model was the way they always encouraged people to keep the coins in their platform. All they provided was a private note with are some numbers and text string, you can not use publicly to verify balance. Does it sound like a Ponzi scheme?
So right now you have no balance is showing on your note but you did not receive the coin too?