It is still active - look at the material in https://speakerscorner.org.au/ , there is material from September 2017. However, Mark who used to the videos could no longer be bothered. There were some views, but it never really became a thing and did not attract more people to speakers corner. He only ever saw it as something to increase its profile and attract more people in person, not to provide something for people permanently planted at home to look at.
I’d have a different agenda, however - if the Pirate speakers corner channel could become a thing, it would not be crucial that people turn up ( though nice, of course).