They already pretty much are. Top recipe hits on Google seem to always be from like "Southern Mama Cooking Tips" or something generic like that, and you have to scroll past 8 paragraphs of context for why this person is writing a recipe and why they like it so much, totally not to hit all the SEO sweet spots, and the full life story of this "Southern Mama" that's totally not a guy in India or a robot scraping together blurbs of text from other website.

It's not entirely SEO, that's part of it, but it's also copyright.

You can't copyright a recipe. It's information that can be freely shared. Anybody can steal it and set up their own site. You can copyright a recipe that comes with a life story. Copyright laws are weird and confusing, but it's really difficult to come up with a better solution.