Its disgusting and in no way will prevent scammers.

I have traded on ebay 13 years still with 100% feedback but a few late delivery stars because buyers dont read the delivery time before they order and then wrongly penalise me.

Now I have ebay/paypal  holding $ thousands for up to 21 days which effectively renders me insolvent.  I will now have to shut down my paypal and ebay account.