I always see this as a stated reason, but I'm skeptical unless it's cargo-culting like "no copyright intended" on YouTube videos (but this is a lot more work). I can't see Adam and Joanne [1] or Holly [2] suing for copyright because when someone stole their Frito Pie recipe and left off the story at top. Especially, when they both have Google-defined tags to grab only the recipe and ingredients. As others have mentioned, the bigger sites (Allrecipes, food network, NYTimes, binging with babish etc.) tend not do the story thing.

Do you have any other info on copyright as a reason?

[1] https://www.inspiredtaste.net/15938/easy-and-smooth-hummus-r...

[2] https://www.spendwithpennies.com/easy-homemade-lasagna/

[3] https://developers.google.com/search/docs/advanced/structure...