Not likely, IMO. And definitely not an abuse of the system. All they want is to push the Cloud to it's limits. And CPU wise, folding will do just that.
I actually received a new access code just last week and I have plenty of instances already folding.
Now if folks don't reduce the memory usage per the new guidelines I would say that's an abuse and will eventually lead to some curbs.
Edited by bwhiten - 2/27/12 at 5:22pm