There is rising sophistication. There is an uptick in countries targeting other countries. Many countries have an army of cyber attackers and they are targeting specific government targets, coordinating their attacks around specific events and activities. They are hacking for a political purpose. But traditionally, most attacks involving IoT were very simple, involving, for instance, gamers and sometimes teenagers.
On the other hand, it is very easy to launch attacks, which are still common. There are websites you can go to where, if you spend $100, you can initiate an attack. There are also hackers who subscribe to an open source model, who publish their code online