[ChatGPT iOS APP] You can only log in to one account on different devices (iPhone/iPad) bound with the same Apple ID.

Describe the bug

You can only log in to one account on different devices (iPhone/iPad) bound with the same Apple ID. The ChatGPT app on iOS seems to be using the iCloud synchronization function to make some restrictions, but it doesn't seem to tell us.

Or is it possible this is an iCloud bug?

To Reproduce

Two iOS devices, e.g. iPad and iPhone
Signed in with the same Apple ID on both devices, and turn iCloud on
Download ChatGPT app on both devices
Log in to the chatgpt account on any device, and keep ChatGPT on the other device without logging into any account.
Wait a few minutes, or almost no wait if your network is good.
You will see that your account is automatically logged in on another device.

Expected behavior

Should not sync accounts like this

The environment where the error occurred

iPhone with iOS 17.2.1
iPad Pro with iPadOS 17.2

Additional context

I tried on iOS 15.8, this issue also exists.

huabin / fsfg

[ChatGPT iOS APP] You can only log in to one account on different devices (iPhone/iPad) bound with the same Apple ID. #27