The simple answer? Because it's not a ripoff. It doesn't look like DF graphically - if you saw screenshots of the two side-by-side you would never mistake Gnomoria for DF. And Gnomoria doesn't use any code from DF.
I play both Dwarf Fortress and Gnomoria.
Was Gnomoria inspired by DF? Sure, among other games, which the developer falt-out says on his website. All games take their inspiration from somewhere - usually other games. All games of the same genre will, by necessity, have some similarities, but the addition of isometric graphics alone makes this not a ripoff.
But, also the two games have different feels. Gnomoria is more focused, DF more open. They play differently enough that sometimes I want to play one, sometimes the other.
Abaddon2020
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