Open source is not necessarily free software, but often is, as that link clarifies: > Nearly all open source software is free software, but there are excepti

Open source is not necessarily free software, but often is, as that link clarifies: > Nearly all open source software is free software, but there are exceptions. The distinctions made in your citation make it clear that Sentry is both open source and free. I don't think there's any incorrect terminology being used here; can you point to a specific misuse?