Okay, I'll grant you that there are some talented artists who are able to convincingly remove ads from images using traditional Photoshop tools, assuming you can find a dusty old computer kicking around that no AI lab wants to bother with. But doing that over many frames, as required for video, is a time sink nobody is going to realistically commit to.

Or maybe you still think we're in the 1950s when there were explicit ad breaks? In modern works ads are injected into the storyline. You can't just start dropping frames at random if you want to preserve the performance in its entirety.