Unlike you most people don't just blindly trust a website to always be perfect and never make mistakes. If billion dollar companies like Microsoft, Netflix, and Google have no foolproof way of accurately detecting fraud 100% of the time then I seriously doubt a faucet with a less than stellar reputation is as infallible as you make them out to be.
False positives are normal and should be expected when relying on automated fraud detection systems. Unfortunately, there is no transparency whatsoever and we have no way of knowing whether people are being unfairly punished, specifically being targeted, or if they are actual cheaters. Unlike any other website with significant presence in crypto they don't offer customer support and they stay away from public forums and social media.