Personally , I find captions annoying to videos posted ... I came to
watch the video ...not be interrupted by someones cute or '
informative ' opinions ...

  But , that's not why I'm here ; I was disgusted when I saw an
advert . using this service over the lower part of the video ...

  COME ON YOUTUBE !

There are much better ways to have advertisers on your site without
destroying the quality of posted videos ...