If I took iText, made changes to it, rebundled that behind a web service - that would be in violation of the AGPL. The thing that prevents that from happening is that the AGPL prevents it based on copyright.
It would be unreasonable to say that every web site out there or SaaS service needs to provide the source code to rebuild their site by someone else.
I will also point out the "write a law" would only apply to one country. Host it in another country and you could thumb your nose at the law. You would really want an international treaty such as the Berne Convention, or TRIPS, or WCT... which are implemented as copyright. Any changes to copyright would imply that that country is withdrawing from those treaties.
It would be unreasonable to say that every web site out there or SaaS service needs to provide the source code to rebuild their site by someone else.
I will also point out the "write a law" would only apply to one country. Host it in another country and you could thumb your nose at the law. You would really want an international treaty such as the Berne Convention, or TRIPS, or WCT... which are implemented as copyright. Any changes to copyright would imply that that country is withdrawing from those treaties.