I have had my email address available on a web page, with only minor obfuscation (escaping characters, sometimes in different encoding schemes) for over a decade. I don't get a lot of spam on that address.<p>I doubt there's any economic incentive for an email-harvester to solve the problem of even trivial obfuscation. These days you can buy tens of thousands of email addresses for a small amount of money. These are harvested from e-commerce and social media, and are much more likely to be real and current, and the targets more unsophisticated about clicking on ads.<p>EDIT: Actually there is an incentive; when the algorithm is applied on behalf of many naive users. So maybe the built-in algorithm in WordPress is actually more targetable than something you make up yourself. This isn't crypto; it's just obfuscation, so being original may help.