(c) Information Residing on Systems or Networks At Direction of Users.—
"(1)In general.—A service provider shall not be liable for monetary relief, or, except as provided in subsection (j), for injunctive or other equitable relief, for infringement of copyright by reason of the storage at the direction of a user of material that resides on a system or network controlled or operated by or for the service provider, if the service provider—"
...
"(B) does not receive a financial benefit directly attributable to the infringing activity, in a case in which the service provider has the right and ability to control such activity"[1]
That's the killer. This service not only charges, they charge on a per-course basis. That's direct financial benefit from the infringing activity.