Contracts the wrote themselves for themselves.
Disney owns Hulu and ABC and ABC owns Grey’s Anatomy.
They aren't being forced to show ads. They chose too.
Shonda Rimes owns Grey's. Take it up with her.
She created it, but doesn't own it. She sold the rights away to ABC/Disney/Hulu
Grey's might have had a contract with an advertiser or other promotional partner that required them to show certain ads during the show.
Yeah, that’s really weird because my spouse and I watched a few seasons of it ad-free on Netflix. I think they had something like 16 seasons available, all ad-free. It seems really odd that the company that produced it couldn’t make it also ad-free.