These people are actors, not tech people. Apple TV probably gave them the best deal when they were selling their show. It really is as simple as that, the people creating these shows have consultants in the tech-industry, but this is acting. There are a ton of Apple TV exclusives, and they are getting paid very well. You have companies like Paramount+ that will start to fund a show, then pull the plug (it's not tech, but the Comedy Central show Workaholics had hired an entire crew and was 5 weeks away from making their movie with Paramount+, and they pulled the plug).
Entertainment is far removed from tech, and I find it funny that such intelligent people from HN would ever think that a Hollywood produced show could ever make it concentrating only on the tech world, leaving everyone else that pays for these services wondering what anyone is talking about.