As someone who has had issues with Ebay and other rewards posting when I've followed all the steps correctly, I was interested to read about the 'No enquiry policy' for Ebay, as raised here: https://www.ozbargain.com.au/node/217626
No Enquiry Policy: We regret to advise that in the event of your transaction not being recorded or being subsequently declined we will be unable to process your rewards enquiry. Please ensure you carefully follow the eBay Special Terms and the General Cashback Guidelines. If you have any concerns please contact us for further assistance.
So, in addition to the lack of a mechanism / some form of transparency around tracking and documenting a claim, and the untimely processing of cashbacks by a number of stores, for Ebay (and no doubt other retailers, though I don't know how many this applies to), we cannot even ask them to investigate.
Personally, I find this very dodgy. While we consumers don't have a leg to stand on, I don't think it's appropriate for Cashrewards to accept retail partners who can't or won't process any rewards enquiries.
If the cash rewards market expands, I expect that Fair Trading / consumer regulatory bodies will eventually step in to regulate the industry / protect consumers, much the way it did when group buying took off.
I would be interested in others thoughts.