You just brought up something that made me wonder. Here on the east side of the cascades in mid oregon, we have some of the poorest soils in the nation (pumice and a low-nutrient silt). Not many types of plants and animals can survive in it. And yet we don’t have carnivorous plants except along the Cascade Crest in the high elevation swampy areas (sundews) where there is a heavy snowpack. Closest thing we have is western juniper, which mines what nitrogen there is from the soil. The chemicals in the needles are allelopathic, which reduces the competition.