Who says it was explicit? They may have done so without understanding the implications.

Your insistence that people did this intentionally, fully understanding what they were doing, is pretty weird. You have no idea why people uploaded these, what their level of technical proficiency was when they did so, or what they understood about the availability of the videos they posted.

Maybe don't claim to read people's minds, and be open to the idea that people do things for a variety of reasons, and often don't consider (or even know that they should consider) the implications of everything they do.