Wikipedia

It's also great for SEO. You get to cram more keywords so Googlebot can pick up on your recipe and think it's a substantial page instead of spam. You link to and from your other recipes to build up credibility and potentially entice a visitor to stay longer by having them check out your other recipes. Most sites have basically zero dedicated followers and rely on search engine in-links for visitors, so they really want to catch the people who are doing a month of meal prep or something.

Sorta. Recipes don't qualify for copyright protection according to most countries, so there is an incentive in cookbooks to write more than just the recipe so prevent someone from just republishing the book. There is something similar with recipe sites, but it's really more about the ad views from someone scrolling down since copyright violation on the internet is so common and relatively rarely enforced.

I've never run into a total failure of a recipe where the proportions are unreasonable or the ingredients don't match, except on instagram.

The worst offenders were black bean brownies (looked like turd, chewed like putty), with carrot bacon coming in a hot second place. But that's not AI fuckery. That's health influencers lying for views, and me fact checking their bullshit.