[mcherm]

I think there is a very plausible argument to be made that it was your CUSTOMERS who benefited, not you.

In other words, I think that if Wolfram chose to sue you for thousands of dollars plus court costs because you violated your contract with them that you would be able to say, in defense, "I never agreed to anything." Since Wolfram delivered the goods (some answers, in this case) to the USERS of your application, not to you, I think this might be a valid defense.

Of course, the strictures of polite behavior extend further than the iron force of the law. Polite behavior suggests that when they ask you not to link to them you shouldn't... which is exactly what you did.