Invidious is an interface allowing access to Youtube videos without going through youtube.com In addition to constituting an advantage in terms of confidentiality (the data does not pass directly through the services of the giant), this interface offers several features:
audio only mode, dark mode, ability to display Reddit comments instead of YouTube comments,ability to subscribe to channels without creating a Google account
the ones who offer, should not ask anything in return
the ones who receive, should not have to give anything in return