It is not, which is why lots of people have been focusing on watermarking–which, obviously, all kinds of actors that don’t feel the need to comply with regulations, either because they are exempt (practically, even if not theoretically) governments, or “renegade” anti-establishment will simply either not implement or not provide the public with the pattern information needed to detect the watermark, so...
> As of July 20, 2023, the AI classifier is no longer available due to its low rate of accuracy.
https://openai.com/blog/new-ai-classifier-for-indicating-ai-...