Stackoverflow updates its policy to not accept answers copy-pasted from GPT

I was going through one of my StackOverflow Posts - https://stackoverflow.com/questions/18310484/modify-http-responses-from-a-chrome-extension/71250307, A notification caught my attention - "We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here." Policy here - https://stackoverflow.com/help/gpt-policy

If the reference is not sited, Isn't it going to be very tricky for StackOverflow to identify if the content is humanly generated or artificially generated? Is ChatGPT a potential threat to StackOverflow?