It's all very well Ebay deciding that a seller must use their SD label or else, but what if an item is valuable and needs a more appropriate postage service? It's hardly sellers 'going rogue' when RM guidelines state that valuables SHOULD be sent with a verified service, either Special Delivery or at the very least with a signature on receipt. These are not available with SD.

I imagine the number of lost or damaged items may be pretty low, so Ebay probably can 'take the hit' on those (altho' it does rather undo the purpose of SD if the item value is not reclaimed). But failing to follow best practice if not  their own guidelines for upgraded postage is a more serious matter.

The obvious reason RM and Evri do not have to refund many unused labels is because the sender has bought the correct one. If Ebay refuses to refund users for unnecessary and unusable SD labels, it won't just be losing (as presumably intended?) the low-value untracked items from the platform. It will end up losing a lot of the higher end items too.