Video services involve bigger files, subtitles availability, streaming load less evenly spread over hours.

But I personally think there are ways involving chunk encryption (one key for many users for the same chunk, but not the same key for everyone ; obviously in the end it’s decrypted and decoded at user’s machine, so opportunity for piracy is not avoidable) and something like bittorrent to make commercial video streaming both convenient for users and not such a technical challenge for distributors.