In some forums that would be handled by signatures. We used to have signatures active, but it's one of the primary targets for spammers to add link-farming spam to. We also have too many users that think text in distracting weird colours and abnormally large font sizes is great visual design, and a small number harbouring a beef with other forum users and long-term project members who like to add messages that are basically offensive. So signatures have been turned off. Anything that provides a Google scrape-able alternative would likely suffer from the same issues, so I appreciate the idea but we aren't likely to do anything like that.
NB: Anything that's of general benefit to our user audience can (and should) be put in the wiki, which is open for anyone to send changes to through a GitHub pull request.