I don't really have a horse in the PadMapper/Craigslist debate but your analogy to YouTube is apt. I have a bunch of videos uploaded to YouTube, and I've permitted embedding because I know that even if a video is embedded somewhere I can still remove the video from my YouTube Channel Manager.
When I upload a video to YouTube, I do expect to retain control of it solely through my interactions with YouTube, and expect that when I take it down it gets taken down across all Google properties. I would be pretty angry if I found that my videos were on another site which had scraped YouTube's data and now was hosting my video without any ability for me to remove it.
When I upload a video to YouTube, I do expect to retain control of it solely through my interactions with YouTube, and expect that when I take it down it gets taken down across all Google properties. I would be pretty angry if I found that my videos were on another site which had scraped YouTube's data and now was hosting my video without any ability for me to remove it.