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There is no problem with pre-mine.
But when you pre-mine you divide the amount into development, bounties, exchange fee, etc. You also provide the official pre-mine wallet address so people can track the payments if they want.

When you ninja pre-mine you keep all the amount, build MNs for you, and after you can ask for donations for exchange fees, development, etc.

If this was my coin and my work, I would have reseted the chain right when I saw other ppl solo mining before the official ann. But they didn't reset the chain so it's obvious that dev&friends premined the coin before official ann.

The fair thing to do now is to make a statement of the amount the dev team premined and what they are going to do with it (keep it for personal use, hardware costs, bounties, exchange fees, etc).