IoT proliferation and adoption is estimated to reach worldwide spending of $1.5 billion in 2018, an increase of 28% from 2017. Gartner estimates improper implementations of security best practices is the only inhibitor to this growth. Energy, oil, gas, transportation and manufacturing are the main industries impacted by the lack of security features and mechanisms built into IoTs. The Industrial Internet of Things (IIoT) is already impacting security in industry sectors deploying operational technology (OT), such as energy, oil and gas.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/iot-security-market-valued-1-5-billion-2018-gartner/