This is a quote from the book "On Zero Confirmation Transactions" by Chris Pacia
...to get the foot in the door.

Once zero confirmations transactions are totally destroyed, you will only be able to transact with a retailer by using one of the quasi-centralized, thi
rd-party solutions that these developers are hoping to profit from as a replacement. That is, if retailers still bother with Bitcoin by that point. ...
read full book block explorer