Leo Barraclough, writing for Variety, on the revenue that “Carpool Karaoke” creates:
Digital is central to how the show is funded, primarily through brand integrations. For example, the “Carpool Karaoke” segment with Selena Gomez included a visit to a McDonald’s drive-thru, which was the result of a deal with the fast-food outlet. “That was an integration and it was incredibly profitable for the show,” Winston said, adding that it also generated 45 million views on YouTube. “We made sure it was incredibly subtle so our viewers would not for a second think that this was a sponsored bit. James and I debated it for many hours.”
The emphasis is mine. I really like Corden and his bit, but I really hate deceptive advertising. I’m actually surprised this isn’t a violation of some kind.