I have did so much research past 2 days about this, and it seems like a big problem.
Its has really no sense at all, because technology of advertising is getting so much changed, advertisers want to use reach media ads and animations.
like HTML5 is so much popular right now, and we are so much limited of using the html5 with that video autoplay limitations..its really understandable for me.
Its not just youtube component but you can't even autoplay video using other components ( and by this I mean the one from GWD editor ) or some others that I've find on google search.
If youtube does not work for autoplay, than I hope there is a option using video component (with loading the video from server ) and some workaround.