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I don't know the full background history of Monero, but I did join early on. I will give you and tactotime props for stepping in to save a project.
However, on the basis of what you have said about Darkcoin, you should offer up to coinmarketcap a similar desire to have Monero listed as premined / instamined because it was forked from BCN and the code contained depotimisation to rig the mining game, apparently.
I doubt optimized miners are considered instamine or premine or everything else. If they were, they would just have to list 100% of coins, because every single one has had optimized miners at various times (and most, including X11, still do afaik)
The distribution of the coin followed the published schedule and the distribution was smooth over time, possibly closer than any previous coin, because the adjustment algorithm works extremely well (it adjusts on a launch pretty close to the actual hash rate within 5-10 blocks). That's the definition of premine/instamine as far as I know it.
Even if you want to count the deliberately de-optimzied miner as being some sort of scam that needs tagging, that only went on for 19 days with a normal (not accelerated) mining output, so really only <3% percent of the coins were possibly affected. Hard to argue that is "significantly" anything (that's the word coinmarketcap uses).