Hi,
Ebay is just a Platform for selling and buying and I do not think they do anything to encourage fraudsters. Some fraudsters do make use of this platform. But it happens at your local shopping mall too, like there will be a guy who sells fake stuff. As long as you check the feedback of your seller, pay by credit card you are safe.
If you have not received the item you purchased, file an item not received claim on ebay, do a charge back on your card.
Withholding information about a Fraudster does not help the community and Please report him to ebay. But keep in mind many high volume sellers do not get the time to check the inventory as often as they wish. Please give the seller time to make good his mistakes.
Regards
Onesimpleman