turbocharged - 10:44 am on Sep 16, 2013 (gmt 0)
Not for free, I'll grant you.
Where there is misery there shall be profiteers.
I'd really question how much upstream plays into penalties. Yes, when a probability threshold has been achieved a site's outbound links may be devalued to 0. But assigning penalties based on not where a link originates but from where the linking site's links originate from would generate wildly inaccurate results.
But in an eco-system where you are held responsible for your IBLs then checking your profile makes economic sense.
There are few other situations where you can be held responsible for another's actions, but Google is doing just that. I'm not sure if you have seen the number of negative seo companies/services growing or threads on other forums where people are hitting sites with spam links indiscriminately, but it is a growing trend to watch. Once again, where there is misery there shall be profiteers.