That is actually a good point, that some users might be encouraged to bad or unsafe behavior by a feature like this.
One solution might be to keep the grid fairly big. I think something in the dimension of 10 km x 10 km as the smallest unit would usually contain at least one road or path that someone could follow.
All in all I am not very invested in the idea, but just interested if that would help filling in the gaps. As mentioned in the discussion here (https://forum.inaturalist.org/t/number-of-inaturalist-observations-gridded-data/16572/3) observations are sometimes skewed to the novel and a tool like this would help gather observations from the center of a distribution, where it might otherwise be forgotten, by being too common.