I have, but I barely do it at all because I have too many of my own projects to work on, and deciphering someone else's codebase isn't a good use of my time for

I have, but I barely do it at all because I have too many of my own projects to work on, and deciphering someone else's codebase isn't a good use of my time for the kinds of minor problems I'd be solving that someone else could solve better.