Now of course you might post anonymously by design, and that's perfectly fine. However I know that the Blogger interface for comment posting is not the greatest: you have to register a profile to post a comment with your name attached to it, and many people are understandably loathe to do so. So if you are a commenter who posts anonymously because you don't want to go thru the hassle of setting up a Blogger profile:
- You can post anonymously with an appropriately spam-proof version of your name/email address (or even just a name)
- If you do decide to set up a profile, spambots will not be able to harvest your ID because of the way Blogger does linking.