How is that unethical?

Evan Duffield built upon litecoin code, changed it dramatically and renamed it to x11 coin.
Was that unethical? No.

But MrSpread takes DRK's codebase and changes it. He then takes the MN code and changes that also.

Thinking about it more, DMN sounds good. We respect darkcoin by keeping MN, but at the same time show's its uniqueness, in that SPR was the first to have decentralized reference nodes.