That’s a minor reason. The bigger reason is that a lot of food bloggers are bloggers and just posting recipes is super boring. So they write their stories because that’s what they actually want to share.
And even from a professional standpoint the Google Search Algorithm played a bigger role. Google rewards more unique content, so a story would do better than just a recipe.
And the story still doesn’t protect the recipe itself. You just can’t have people using a web scrapper to copy paste your entire content. But you can take the exact same recipe and add it manually into your cook book. You just have to go through the minimum effort of rewriting the steps.