If they put the content they actually want to link to at the address of the OpenID, they'll have achieved increasing their SEO

*cough* SEM.

SEO is, if used correctly, referring to internal site jiggery pokery to make it accessible and search engine friendly. SEM is trying to give it a higher PR or specific keyword.

but you're right—if people don't delete dodgy spam comments, and I know it's a bigger issue on dead journals, not yet a problem here.

But also once a spamming OpenID is caught, a site wide removal happens, right?