For the one of the reasons you might want the various things you look at online to be encrypted - for privacy. If the stream is encrypted, an eavesdropper can't

For the one of the reasons you might want the various things you look at online to be encrypted - for privacy. If the stream is encrypted, an eavesdropper can't tell which video you're watching. This might be even more important if that video is unlisted or private - an eavesdropper could watch the video that they wouldn't otherwise be able to.