I think it becomes extra-silly when you think about how easy it is to circumvent most people's additions.

I get phone call solicitations, I think from posting my phone number on Craigslist. I thought about obscuring it, and then started thinking about how most of them are so easy to decode--so I tried it for fun. Filter parentheses, whitespace, change "six" to 6, etc. See if you end up with ten digits.

Phone numbers are easier than email addresses, but I was able to scrape 95%+ of them properly, and would have gotten higher with any real effort.

I'd post the code if I could find it. It was trivial.