BoM actually makes it quite difficult to obtain data. I looked into it once and thought it wasn't worth the trouble. Some agencies make it easier than others to obtain the raw data as it's sort of part of their mandates.
I wish they used better open licensing. The public ftp has great free products, including fire danger ratings and observations, but the licensing mentions “Users intending to publish Bureau data should do so as Registered Users.” This costs a couple of grand and removes the barrier to a lot of potential great community apps being built.
And they've made it even more difficult over the past few years. I had written a script that would scrape BoM's page and send the up-to-date conditions via MQTT but it stopped working a few years ago. IRIC, even changing the HTTP headers/user-agent prevented it from ever working again. That said, I understand it's absolutely their prerogative and they have a right to make money from the data.
