"... is there any video of the presentations? ..." Asked of previous demo days, and the standard answer has been "no" - probably due to companies not yet ready

"... is there any video of the presentations? ..." Asked of previous demo days, and the standard answer has been "no" - probably due to companies not yet ready for release. I thought the purpose of demo day was to allow VC's a sneek look at the latest YC recruits not a general public launch.