This is theft that gets around a copyright loophole. Don’t steal recipes.
Where is the limit ?
For me it's just a web browser optimized for recipe websites. It's basic scrapping. Google does it, why can't I do it ?
Are "reader mode" browser extensions theft ? Are ad blockers theft ?
Is using Lynx as a web browser theft ?
If your business depends on your content never being scraped, you are screwed.
Ad free recipe sites are already handled, you pay a subscription fee instead.
That being said, the final format of an onlyrecipes scrape is very attractive! It would make for a nice intentional feature of recipe website, so the producers can still get their impression revenue and the readers can enjoy such a pleasing format
Specifically creating products to damage these people's returns because of your inability to scroll, use page down, ctr f to move quickly to the information you need is your own weakness and it doesn't give you a right to someone else's labor. You know that without a long ethics conversation. Most recipe writers will fail hard and most who try to create revenue through the ad model fail hard. You want unrestricted access, pay a subscription fee, just as you would expect for your own efforts.
There is no Grey area here, you know and understand the problem and the excuse of laziness or the importance of your time for a 30 second operation wouldn't hold up with anyone.