Also they can cross reference possible relatives to find you. I listen to a lot of true crime stuff and it's actually wild how far we've come in just 40 years. Like the game has changed so fucking hard for preserving evidence and what you can get from it. Then again almost everyone is carrying a tracking device on them at all times so it's pretty damn obvious to find out if someone did something bad. And if you didn't bring it when doing your crime? Automatically suspicious (assuming you always have it on you). 

This is on my long list of things I think about if I wanted to really go live in a woods and not be found. It gets harder every year and I do think it might become impossible in my lifetime. I'm not about to go wander aimlessly in the bush ranting about Linux like Luke Smith, but I would like to live in a world where that's an option.