Humans need something that touches their problems. Since the majority of humans are those who feel they can't do anything without the help of others, they are naturally drawn to a video discussing their problem.
Even if the video doesn't provide a solution, it at least tells them that something is wrong with the world's system that they ended up like that.
Since there were quite a number of people sharing Arthur's video on various social media, it spread very quickly.
Everything was made even more interesting because the speaker was a young man who even if he acted stupid, would still interest young ladies, not to mention what he was doing in the video, telling people the truth.
Among those who knew Arthur, the first to know about the video were the directors of the European Branch of the Mossad.
They didn't watch him directly, but there was always some action that let them know if Arthur did something conspicuous.
