`clientUser` required in the init

[pjanik]

Docs say:

You also need to identify your logged in user. Instead of <YOUR_USER_IDENTIFIER>, pass in any string that uniquely identifies your user, such as an email address. It will be cryptographically anonymized with a hash function.

What if it’s a webpage without user accounts, or if users aren’t logged in yet? Should I just omit this parameter?
The documentation here and on the website doesn’t seem very clear about that.