That being said, and I agree with all points you raised, the Australian Gov has been fantastic over the last few years of focusing on open data, to give credit where it's due.
To be fair, from looking at the available datasets of different countries, it seems that weather data tends to be the one requiring business-level licensing. There are exceptions like Norway's Met (https://api.met.no/) and US' NOAA (too many to list), but unfortunately the usual answer for "weather data?" is "pay first".