The data sharing is done between accredited providers. You as a consumer consent to your data being shared from a data holder to a data recipient. All providers must be accredited by ACCC in order to start sharing data.
An accredited data recipient receives consumer data to provide a product or service; whereas an accredited data holder holds consumer data and can transfer the data to an accredited data recipient upon receiving a consumer’s request and consent.
You can find a current list of providers on the CDR website.