"How many cases are ok" (aka "zero tolerance") is a doomed to fail approach. Especially for a complex social problem's interaction with a complex new technology.

If you want to find out if ChatGPT is doing something wrong, there are many methodologies available: compare to other groups of people, statistical studies, etc.

I also think OpenAI's business model is pretty well aligned with the goal of users not killing themselves for like 100 reasons. And they do appear to take it seriously.