I’m not saying it’s ok. But I’d be willing to wager that no one at Netflix had any ideas where those images came from. The design was most likely from a design agency, and even the top brass at the agency probably had no idea where those images came from. At the root of this there’s a designer who’s probably been asked to rush out a design, they’ve taken a shortcut and they’ve been rumbled.
Again, it’s not OK to steal images, but I seriously doubt Netflix knew that’s what they were doing.