Some don't like dark themes and see them for gaming only - but all the TV networks in the US use them, minus CNN and Fox.
www.cbs.com
www.nbc.com
www.abc.com
Well, I suppose it's due to the video showing up better - but then again, Fox and CNN don't have dark themes.
www.cnn.com
https://www.foxnews.com
Well, are these good choices for themes?

CBS TV Network Primetime, Daytime, Late Night and Classic Television Shows
Watch CBS television online. Find CBS primetime, daytime, late night, and classic tv episodes, videos, and information.


NBC TV Network - Shows, Episodes, Schedule
Watch full episodes of current and classic NBC shows online. Plus find clips, previews, photos and exclusive online features on NBC.com.
ABC Home Page - ABC.com
Watch the ABC Shows online at abc.com. Get exclusive videos and free episodes.

Well, I suppose it's due to the video showing up better - but then again, Fox and CNN don't have dark themes.
CNN - Breaking News, Latest News and Videos
View the latest news and breaking news today for U.S., world, weather, entertainment, politics and health at CNN.com.

https://www.foxnews.com
Well, are these good choices for themes?