Tube sites *may* be protected under the Online Copyright Infringement Liability Limitation Act because they can be classified as an intermediary online service provider (a file host). As such, they *may* be shielded from the infringing behavior of their users who *may* be uploading the files in question.
However, there are some stipulations to this protection, such as proving they receive no direct financial benefit from the infringement and honoring take-down requests from the copyright holders.
Zuzana's tube site uses licensed and sponsor-provided content and so no infringement is taking place. Kudos to her
