Most of what you get from Identity Guard you can get for free from Credit Karma. CK offers free credit scores (sorry, just one) and free credit monitoring.

Identity Guard adds an insurance policy against identity theft, plus something they call SSN monitoring. And a few other smaller things like lost wallet "protection". The SSN monitoring is kinda vague on their website, but it looks like they watch for bank accounts opened with your SSN. They might also actively search the web for your private info and alert you if it shows up(?).

I've never used IG, but my suspicion is that if someone opens a bank account with your SSN, or posts it on the web, then something else they do will show up on your credit report around the same time. That would be spotted by CK's monitoring. So the value added by IG for $9-20 per month seems questionable to me.

I'm not saying it's a scam, just a weak value proposition (to me). They are definitely a legit company that's been around for a number of years.