There was a draft of GPLv3 that included such a clause. This was dropped with the development of Affero GPL license. The final version of GPLv3 dropped all language regarding web services. If you want to use a GPL-like license for a web application, then the AGPL is the license to use.
Comments
GPLv3 (the license used here) applies for web services as well AFAIK and imposes the same requirements for distribution.
There was a draft of GPLv3 that included such a clause. This was dropped with the development of Affero GPL license. The final version of GPLv3 dropped all language regarding web services. If you want to use a GPL-like license for a web application, then the AGPL is the license to use.
Interesting. I was not aware that this was contained in the draft and then removed. Tnx for clarification.