Yes, even purchased games have constant coin purchase reminders. (thevitalounge.net)
They reuse wallet addresses or simply use KYL / AML (Know Your Customer / Anti-money Laundering) verified coins purchased on centralized markets to buy «illegal» stuff on the Darknet. (freedomnode.com)
To take advantage of this unique opportunity, you only need to do one thing: make sure your new apps and app updates are submitted and approved by April 25th so they'll have the best chance of being available for Coins purchases at the launch of the program (and when we give customers their free Coins). (developer.amazon.com)