Title is a bit misleading:

The ABC is shutting down almost all of its official accounts on Twitter – now known as X under Elon Musk’s ownership – citing “toxic interactions”, cost and better interaction with ABC content on other social media platforms.

There will only be four remaining official ABC accounts: @abcnews, @abcsport, @abcchinese and the master @abcaustralia account. ABC Chinese reaches Chinese-speaking audiences on X.

“Starting from today, other ABC accounts will be discontinued,” the ABC managing director, David Anderson, has told staff.

So they're keeping their main, largest accounts alive.