But, my understanding is that you are allowed to scrape sites as long as you don't impact their ability to deliver the site to other users. In other words, don't DDoS them. Sites tried to ban scraping but last I remember seeing it was not enforceable unless it was done at high rates or maliciously.
As for content, certain things like recipes aren't protected content because they are "listings of ingredients". I can imagine a job opening / title might follow that same logic, maybe the job requirements and benefits as well.
What is protected is the way it's presented and organized. So if you have the same jobs with the same filters and same layout you might be exposing yourself to trouble. You have to make changes in the way it's presented, which for copyright law is changing 50% or more.
So if you're scraping a job site and only showing remote jobs or jobs in a certain skill set, or you're showing the job along with some stats about the company you're probably in a safe spot. But again, if you want to make a business out of it it's probably good to talk to a lawyer first.