I'm a bit wary about URLs because not everything needs to be based on DNS. If you hold any data at all at the URL, you have to deal with squatting, expiration, maintenance, and you also either have to find a host (and DIO shows that it's not really a thing) or doxx yourself to get the domain.
And if you're writing paradigm-changing anti-government manifestos, you want an ID but you don't want to doxx yourself.