@senicar is 100% correct. Data correlation is HUGE.
Really, the only way to be truly hidden is to use a box very far away from your house, and use a high beam antenna to connect to free wifi somewhere. Then use Tor. And randomise the mac address of the wireless adapter.
Even then, you need to ensure your phone is turned off, and that your vehicle isn’t picked up by ANPR or cameras on the way to and from your hideout location, and you need a good alibi.
Really, there is no full proof way to do this. Ride a bike, in all black, at 3am, and hope nobody spots you, so you can travel to your secret hideout location, do your sketchy hacking stuff, and then ride home, removing all trace of yourself at the hideout location.
Sounds kind of unrealistic right? This is the kind of lengths the likes of the Shadow Brokers will have had to go to get away with what they have for so long. The other facet to this, is that you’ll need to rotate locations, and then make sure they’re truly random, because then they have a better chance of narrowing it down to you.
The way I look at it, you’re at a massive disadvantage doing anything sketchy. So is it really worth the effort? When you can be whitehat, legit, and still get paid good money; and sleep soundly at night not worrying that law enforcement is going to raid your house at 4am.
Many criminals have huge ego issues, and they think they’ll never get caught, and that usually is what leads them to getting caught, taking risks and bragging.