There’s some issues with iNat and bias in data, these two a good read:
The second has a great comment by @alexis18 showing a very nice side-by-side graphic of GBIF vs iNat data showing relative representation of top taxa at the bottom.
I’m a plant guy, so I usually ignore non-plants in observation. I also ignore Grasses (Poaceae) and many non-flowering plants. I also do short hikes so I miss anything that’s farther away.
Hopefully, there are other observers in my area who are interested in non-plants, grasses, etc. and enjoy longer hikes to balance out biases that my observations add to the data.