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This was only uploaded after they had fallen through getting a sponsor for the series. John August decided to show it to people because it was unlikely that it was going to be seen anywhere else.

That's probably because they can transmit in proper HD.

Also the "liked" metric is just a way of favoriting--I'd assume any sponsor scouring the web for stuff like this would understand that.

I'm sure they are using Vimeo for quality reasons, but I could be wrong.