I was one of "the Equifax millions."
No identity theft monitoring service (and since I was also one of the Anthem folks, too, I've got several) has ever encountered any of my information "in the wild" or on "the dark web." This has been being done, monthly, ever since each one of these breaches.
This kind of data has a very limited shelf life as well, because information is shared between firms about exactly what needs to be watched for. I don't lie awake at night all these years later thinking my identity will be sold/stolen, as the window for that is now long past.
Again, I look at what's probable. What's remotely possible, but highly improbable, isn't ever going to be my focus.
"Given enough resources" virtually anything is possible. But lets face it, when it comes to theft, including cyber theft and identity theft, it's generally "smash and grab" and then get what you can, while you can, which is generally a very short window indeed.