Optus exist in a competitive market, their ability to raise prices to pass this cost on is limited.

Due to Singtel gutting Optus's onshore support service Optus has been losing market share for years and has had to rely on heavy discounting. In 2021 they posted a $208m net loss.

This is probably the end for Singtel in retail telecommunications in Australia, and I don't know who would buy their network now that TPG and Vodafone have merged. They may just convert it to a much smaller wholesale only operation.

There was a time when they used to charge 14cents a text message. They should have plenty of cash.