You can add steps in a Journey that include other websites which can even be competitors - think about it this way, you are Toyota, you will spend time and effort and get the click, then the customer will come to your site and then go back to google and search and go to the next site and so and so forth. Imagine would it not be nice to let the customer experience their entire journey on your website, where you have laid out all content they need to consume to reach an informed decision.