Given the debate here, it's probably best to take the significantly premined mark off of Dash until we can figure out a more appropriate solution. I agree that instamine is not the same as premine.
I see a few options here:
1) Change label to "Significantly mined around launch" or something among those lines
2) Make an instamine label
3) Not care about tracking instamine
I'm preferring #3 because "instamine" is not a well defined term and can be applied subjectively.
I see this as a wise choice. It is easy to see why you would not want to dig through this forum trying to vet the launch of every coin listed on your site based on a subjective criteria.