I agree, even if we assume what he did is illegal, its sort of like impounding someone's car and arresting them for dangerous driving because they went 1 mph over the speed limit. We don't do that even though it is technically illegal because that would not be a good use of the legal resources we have, which are finite. Same thing if we arrested and imprisoned everyone who fiddled with url parameter, it would be a waste of finite resources. Probably a phone call saying 'Hey can you please stop doing that would suffice in most cases.