"Monetary activity will out compete spam for block space."

This is a baseless assertion made by the moderates. (They are moderates because they are at least prepared to admit spam exists and that it is bad).

You can get 85 thousand computers to store your data for free. Forever! Or at least until they get sick of doing it.

Unless Bitcoiners work *extremely hard* to make leeching off the network as cumbersome and expensive as possible, spammers *will* turn Bitcoin's blockchain into a mechanism for storing unwanted data on the computers of unpaid volunteers.

The fact that we can't even update spam filters without a fight tells anyone paying attention that Bitcoin is being stewarded by people who don't understand how it can be attacked, let alone how they might go about defending it.