The advice given to me in high school (I was working on tech projects after school for several teachers and groups) was to not even try or explore poking around the IT networks it no matter how good my intentions were. All it takes is one grumpy school administrator to feel undermined or to misunderstand your report and you could be expelled.
When you're in a position like a student, you're still working your way up and building credibility. No need to risk it all for an IT group that doesn't want your security advice and didn't ask for your help.
"Know where your boundaries are and who your stakeholders are, don't do anything that will make your stakeholders look bad." It's a life advice given to me by my high school teacher that served me well in my professional life.
And you just volunteer to be thrown under the bus as that "hacker."
Anonymous, maybe. As a student, under 18 - you're "immune" from many things - but it can be a stain.
I realize this is conjecture but I'm giving an example. Speaking from experience receiving "security reports" from users and students, often times they fail to understand the full picture of IT. As a student with no buy-in from the stakeholders, the risk isn't worth it.
For example, let's say this IoT network was managed by a vendor who, while having sloppy configuration practices, also had network monitoring looking for APT/anomalies (such as new connections in off-hours or unusual connection rates or bandwidth usage.)
While the student thinks they're being sneaky and hacking the system at night, opening ssh connections to a hundred devices from his laptop, there are now reports and alarms going off on a monitoring system. Some basic timestamps and VPN access logs would be enough to point to the student. So this student thinks they're creating an anonymous harmless prank, but the IT department is already investigating a malicious actor on their network. How do you think this would end?