Something being legal doesn't make it ethical. I'm also disgusted by this attitude of "screw you and the labor you invested to create and share this recipe."
Almost none of the sites publishing recipes online created those recipes. Very often, no-one there's even cooked them once.
I regularly get recipes from real people who really make original (as far as recipes can be original) or adapted recipes. No, it's not plagiarism all the way down.