Since when is OpenAI able to detect if same password is used on another website? 
Yeah, creepy. Obviously they don't hash the password.
I bought a domain using the full name of one of my client, the client was lucky that I found the domain which contained the exact letters of his full name. After purchasing the domain I was curious to know what OpenAI think about the name [not the domain]. I asked and it answered me with the domain name too, there were other details which I can not verify but when I saw that OpenAI knew the domain name which was registered not even an hour ago, I freaked out.
OpenAI is taking notes of every key you are pressing on your keyboard.
If you are typing your seed then type it offline. Even better after setting up the seed, reset the windows to make it a new computer.