The amount of times I've seen breaches of e.g. open source licenses dwarfs the number of patent cases I've seen. Generally, the creator has no recourse, because they can't prove it most of the time (closed-source product), nor can they afford the court costs if they wanted to, so it just slides. Sometimes changes are made (e.g. GPL-using code open-sourced), but often they aren't, and it's largely because the offended party is small and can't properly defend themselves, so it isn't worth it.