Just discovered when placing an order this morning that returns are no longer free. I didn't receive an email from them to let me know of this change, nor did I notice anything obvious on screen when looking at items or placing the order so I'm assuming they want this to be as quiet as possible.
I jumped on their online support chat to ask for some details and they confirmed that all Australian returns will now incur the fee of $8.99 - regardless of whether you are subscribed to ASOS Premier or not. I also asked when this new fee was implemented and they refused to answer that question until I pushed them on it - started 'mid this month' (June 2023).
Interesting. If I recall correctly, they were one of the first clothing retailers in the UK to offer free returns (which wasn’t common thing early-2000s) and that’s one of the reasons they shot up in popularity. You could order 2-3 sizes to determine best fit and return the others.