You can't change ChatGPT email address, either, fwiw.
The email I signed up for got compromised a couple of months ago and I ended up having to delete my entire GPT account, losing all my history, to recreate using a new email.
It was super annoying and, out of hundreds of websites I had to update, only OpenAI and Anthropic wouldn't let me change my email. A few of them required contacting support with some sort of proof, but at least doable.
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