I can’t say I’m familiar with that particular event. But I’m guessing there is a difference there in that iMessage is well, a messaging service. YouTube isn’t, their videos are on public webpages.

All Freetube and company needs to do, if it comes to it, is find a way extract a video from a public webpage. There’s a million ways to do that.

iMessage is not a public webpage, and so there is no real way around it unless you go through their api.