Commenting as a reaction would help more than just downvoting of course, because I am still not seeing how, as a consumer, I am supposed to know that those are

Commenting as a reaction would help more than just downvoting of course, because I am still not seeing how, as a consumer, I am supposed to know that those are illegal keys. Other platforms that facilitate fraud on this scale are always forced to take action, yet ebay gets away with it. I am wondering why that is.