The Affero GPL is partly motivated by this use case. It doesn't fully solve the problem, but it means that your competitor who grabbed your code base and set up

The Affero GPL is partly motivated by this use case. It doesn't fully solve the problem, but it means that your competitor who grabbed your code base and set up an open-source clone, will at least have to keep open-sourcing all their stuff, too, leveling the playing field a bit. Alternately, it can serve as a kind of poison-pill to keep some competitors and would-be competitors from using your tech.