You can now block #chatGPT by adding this to your robots file

User-agent: GPTBot
Disallow:

or partially:

User-agent: GPTBot
Allow: /directory-1/
Disallow: /directory-2/

Source: https://platform.openai.com/docs/gptbot

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@goranmajic Just to confirm, shouldn't it be "Disallow: /"?
@tedel yes, lost it while pasting. Thanx!