The reality is much worse.

For over a decade the BOM themselves ran ads on their website:

https://www.governmentnews.com.au/online-ads-now-permanent-f...

https://web.archive.org/web/20230605202001/http://www.bom.go...

They appear to have stopped the practice in June 2023:

https://web.archive.org/web/20230515000000*/http://www.bom.g...