So your work starts out when you click "new" being named something like "goldfish-apple-gasoline" and it supports an obvious "rename" operation if they want to

So your work starts out when you click "new" being named something like "goldfish-apple-gasoline" and it supports an obvious "rename" operation if they want to take control of it. You're welcome to implement this in your own product. You will almost certainly receive emails about "I just tried logging in using the same email address I've used for 8 years and it doesn't work. Why is your website broken?" (This is true of any website which supports standard logins and any additional method, by the way. If you have standard logins and Facebook accounts, people will sign up with FB and then try logging in standard, etc etc.)