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For the technical aspects, our vcs didn't / don't care. That's our job to figure out, and if we don't, they fire founders.
I'm honestly not sure how you would seriously audit chat app numbers, and I suspect and hope Abraham Shafi is going to prison. For most businesses, if you have to seriously audit things like that, you probably shouldn't be investing. A company inflating their numbers by 20x will be pretty hard to detect, and our safeguard as an industry is that's fraud, and people go to prison for committing fraud.