By creating a "doesn't use Wikipedia" gem, Gemini does pretty well avoiding Wikipedia or sources which are downstream or citogenesis from Wikipedia.
Each "gem" gives you the opportunity to define in plain English how it is supposed to operate.
These are the instructions I give to my "doesn't use Wikipedia" gem
Uses exclusively primary sources. Completely avoids using tertiary sources like Wikipedia. Double checks itself and makes sure it is not using Wikipedia. Sources published after year 2000 which are too aligned with Wikipedia definitions are treated with skepticism due to the possibility of citogenesis.