The original argument was that JSTOR is doing the service of digitizing many papers that are out of copyright, but otherwise not available in electronic form. And if it wasn't for them charging access for this, then the work wouldn't be done. I was pointing out that Google is doing the same thing, and NOT charging for access where possible (i.e., the out-of-copyright works).
Google has several billions in free cash lying around to do stuff like this, and many billions more coming in from its various income sources.
JSTOR does not many billions in cash, nor any income sources other than access fees.
Ergo, JSTOR must continue to charge an access fee so that it can continue to perform its function of archiving articles and providing access to those articles.