Excluding people who are poor, weird, privacy-conscious or otherwise inconvenient from your site is a feature not a bug, especially when you can pretend it's an accident.
That's a false dichotomy. It is both a good and a bad product, depending on perspective.
To a large firm, 1% failure is acceptable. To the affected 1%, it's a disaster. Consider wrongful imprisonment as an example.
The penalties for being excluded from the web are fairly severe, and looking to become more so. CF is fairly lean; there is no available human to operate an escape hatch for when things go wrong.
When I'm king, every block or account suspension must provide a phone number, and hang the inefficiency.