Where can I find a data set on trust in the Internet? I looked everywhere for a data set on trust in the Internet of things and I found nothing...

The articles I read didn't mention the data set used or the data set was not a public one.

I even emailed two publishers for the data set and they didn't help me.
There is a sub page about open data, you can try ask there. If it's about health, you can try looking into HINTS  which in some years might have asked questions about Internet use. You can also look into PEW, which has a branch looking into use of Internet and technology in the US. Some of the data sets are freely available.