Is TTS API free or someone is abusing ChatGPT private APIs?

I found the website gpt-reader (unfortunately I am not allowed to provide its URL here, but you’ll find it) that links to Chrome and Firefox extensions with the same name.

It advertises that it provides OpenAI voices completely free with no limits. As far as I know, those APIs are paid and most likely someone has hacked ChatGPT private voice APIs and used them (which is illegal). Am I right on this?

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