What statements are compelling?
About the profit model
You mean the pay-what-you-want model? That existed for some time:
https://en.wikipedia.org/wiki/Pay_what_you_wantAlso, what FatManTerra fails to understand is that people do not need to click the donate button. From his thread:
Interestingly, ChipMixer released with a "pay what you want" model, which is uncommon for mixers. Users were not charged a mandatory fee for mixing and instead could donate to the website. As any tech entrepreneur will tell you, donations are usually not a viable business model.
If you have 0.0125 BTC, you just send the entire amount to CM (out of convenience + it's better for privacy) and they give you a 0.01 + 0.002 BTC chip. The change of 0.0005 BTC is automatically donated since there is no chip of this size. You just paid a 4% "fee"!
Then like I mentioned on my last post, he just assumes CM has zero revenue.
The story starts getting suspicious when you look at ChipMixer's expenditure. With zero revenue, ChipMixer paid out several large alpha tester bounties, bought ad space on the forum, and ran a large signature campaign, with expenses in the tens or hundreds of bitcoins.
Even I have received a few hundreds in donations from people who DM'ed questions about the mixer, so I highly doubt this is true.