Is trustworthiness just an IIC effort?
No, trustworthiness around cyberspace IT systems was originally introduced by the "Committee on Information Systems Trustworthiness" in 1999, resulting in the book "Trust in Cyberspace", see free download at https://www.nap.edu/initiative/committee-on-information-systems-trustworthiness. in 2016, NIST had an two-day event, titled "Exploring the Dimensions of Trustworthiness: Challenges and Opportunities", see summary and recorded sessions at https://www.nist.gov/news-events/events/2016/08/exploring-dimensions-trustworthiness-challenges-and-opportunities, including a keynote by Vint Cerf (https://en.wikipedia.org/wiki/Vint_Cerf).
Trustworthiness is essentially an umbrella term that encompasses many "characteristics" and "qualities" in a system. What makes an IoT-enabled system trustworthy may be different from what makes an AI-enabled system trustworthy. It depends on what is expected to be "worthy of trust" and the expectations of the stakeholders. Also, these characteristics and qualities (at least some of them) may be subjective in nature, example liability.