AGPL does help with this. An early example was when Google's search interface answered unit conversion queries using GNU Units. They fixed a bug internally and didn't flow the bug back upstream. Since they weren't distributing Units, but were only executing it as a service, their behavior was strictly conforming to the letter of the GPL. The failure to respect the spirit of the GPL was a factor in AGPL's development.

AGPL code is strictly forbidden for use inside the company now, partially because they consider private modifications to open-source software to be a competitive advantage.