A key point, however, seems to be whether the site accepts regular payments from a large source. But in certain cases, it sounds as though DMCA Safe Harbor could be circumvented to shut down payment to a supposedly bad-faith site. Could shared hosting companies be put at risk, for payments for all account, if some of their accounts (even one) infringed?
It's very dangerous for Congress to play with holding large service providers responsible for playing "Brother's Keeper". The actual infringers should be pursued, not the hosting companies. But, of course, some people disagree with the "amateurism" culture of the Internet, after centuries where everything was vetted before it was put out and a "right to self-publish" wasn't presumed.
These substance of these hearings should be monitored closely.