There are many people who use the software, for free, to monitor their own non-competing software projects (it turns out that overwhelmingly most people aren't

There are many people who use the software, for free, to monitor their own non-competing software projects (it turns out that overwhelmingly most people aren't competing with Sentry). Some people choose to scratch their own itch and commit small bug fixes. For example, if you are running Sentry internally and you're monitoring a dozen software projects with ~50 users, it might be in your interest to fix some edge case you've hit that's causing your team grief. You could also open up a ticket on GitHub, or do nothing at all and just continue to use free software as-is without contribution. It sounds like you aren't a user and have very little incentive to contribute. So I agree, don't!