Yes, this set off all my 'gpt warning bells'. Anyone know the latest on automatic gpt detectors? Feels like it should be easy but last I checked they had a lot of false positives.
The problem is that you need to actually do training to detect AI text, and no one wants to spend money on that. The actual implementation is very easy:
1. get a corpus of real text
2. generate a corpus of AI text
3. train a model until it can tell the difference
The problem is step 2 is semi-expensive and step 3 is really expensive, so everyone is trying to shortcut the process, and of course it doesn't work.