I'm very much of the opinion that no bit asset should be on coinmarket cap, since there is no such thing as a bitasset market capitalization (except that it is backed by collatoral BTSX). bitUSD/bitAsset market cap is already included in btsx. Technically, if you get a bit asset on coinmarket cap (which doesn't really make sense, it's more of an OI than a market cap), you also should subtract the corresponding value from btsx's market cap.
Here, I tend to take the position that doing it the way you're describing, though technically correct, is way more hair-splitting than it needs to be. In my view, the point of CMC is cheap publicity and bragging rights, not nitty-gritty details.
Sure, bitAssets are categorically different from assets on other platforms, but we want it to play in the same space as other cryptos, and getting it listed on CMC would increase its visibility. Right now people mostly think it's pixie dust that's "supposed to prediction market peg what?" If people had a chance to publicly watch the OI of BitUSD grow while maintaining a constant share price around $1, that would be money in our bank.
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