I work at Google, and get pull requests from people on other teams fairly frequently. It's usually stuff like "I found this particular pattern results in a mem

I work at Google, and get pull requests from people on other teams fairly frequently. It's usually stuff like "I found this particular pattern results in a memory leak, and fixed it Google-wide", but sometimes it's "hey, I used your code, and fixed a bug". It's a bit like how things work in the open source world; it depends on the situation and the individuals, but patches are usually welcome. The only case where I can imagine someone getting into trouble would be if they spent a ton of time fixing a random bug when they're meant to be working on something else, and it resulted in something important getting held up.