I keep my credit locked down and only lift it briefly for checks that I authorise. There are not many. Not only is it free but it does not allow snoopers to even view your credit score so far more private than the so called 'credit protection' services out there.
Everyone should do this. There is no way to know whether you have been hacked. I got a letter from an organisation recently saying that 'my data had been compromised' three months prior.
Locking down your data has some unexpected benefits. The company that I have used to insure my house for many years recently contacted me because they were unable to pull my credit. What on earth were they thinking? I told them I would find a different insurer if they ever tried that again, they backed down very fast.