thunderarea

This is what the program policy for the extensions say: "An extension must have a single purpose that is narrow and easy-to-understand. Do not create an extension that requires users to accept bundles of unrelated functionality. If two pieces of functionality are clearly separate, they should be put into two different extensions, and users should have the ability to install and uninstall them separately."

Are you sure that it blocks the video? I think that just plays the video in the background

No. This is one of the main features of the Premium YouTube

In addition, since I am the creator of this extension I had a similar problem in the past. Chrome Web Store had rejected one version of my extension with the explanation that the adblocker function is irrelevant to the main purpose of the extension. I send them an email explaining that the adblocking function is crucial for my extension because the ads interfere with the extension and cause problems in its function. Google apologized and accepted the extension.

Yes. The extension block the video URLs and keeps only the audio ones that sets them as source in the video

why? What is the difference?

This is a possible scenario. But there are many ad blockers out there with millions of users and they continue to be accepted by the Google

This extension uses the ability that Chrome Extension API gives to block some URLs. So it blocks the video and keeps only the audio since the YouTube serves them in separate files

Yes of course. But it is not permitted by the API policy

If you have a slow connection, or you want to hide NSFW content on YouTube there is Music Mode for YouTube™ a Chrome extension that blocks the video and plays only the audio on YouTube and YouTube Music. Additionally, it skips the ads and hides the thumbnails (optional). So, you can convert YouTube into a music player. It helps you a lot to save bandwidth while you work or play games listening to music on the background and also reduce the use of RAM, CPU and GPU since there is no video. Finally, it helps you focus on your work and spend less time on YouTube clicking on clickbait thumbnails. Give it a try!