I tried, it’s the same for me
About the issue
Looks like it’s caused by the server responding with 403 Forbidden which is the usual code for banned and rate-limited IPs. But sometimes the dev tools show NS_BINDING_ABORTED, while still showing the response? I don’t know how it works.
Alternative
Consider https://anonchatgpt.com/ as an alternative. Although it’s quite a lot more limited, e.g. you can’t have a “thread” — only one message is handled at a time.