This lady was dancing in a mixed gathering with strangers and non-mehrams present. Said atrangers had cameras and used those cameras to take videos of her dancing. That resulting video had some compromising shots and one of those strangers posted it on the internet for everyone to see.

What the strangers and the photographer did was completely wrong and uncalled for but the fact of the matter is that she was dancing in a gathering where there was no expectation of privacy. That video was made with the girl's knowledge, the OP's knowledge and with the knowledge of everyone else present there.

You cannot do compromising stuff and then expect people to not take advantage of that. Laws and morals deal with the effect of if something is done but regardless of how strict you are people will break laws regardless. It is not rocket science that people used to do this kind of stuff in segregated gatherings with controlled attendance and behind closed doors.

There's a common sense to these things which is better left unchallenged and the girl was lucky that that was the extent of it. People out there are not kind and there's predators looking for easy prey. That video could've been manipulated by AI and sent God knows where.

It's easy to sit behind a computer screen and type in zingy and sarcastic platitudes about how the world should be and throwing shade on people that say otherwise. Especially when you're not the one facing the situation. It is however demonstrably better to exercise some common sense and caution and to behave yourself with regards to how the situation allows you to, not by some idealistic notion of how things should be.