Using Google, someone search for a proprietary video protocol (IIRC) and found tons of video streams that weren't even password protected. Some in schools, some in warehouses, and some just on the street as part of neighborhood surveillance. I think I have the link saved, I'll look for it.
https://exposingtheinvisible.org/guides/google-dorking/
I've personally dabbled with it a bit in the past, and while I didn't find anything particularly interesting, it did make me a bit more cautious about enabling anyone with a link to access a Google Doc. With a good enough scraper or even just a lot of patience, there are a lot (potentially sensitive) data out there for people to harvest. That's not to say there aren't a number of benefits to having access to advanced search tools though, just that individual mindfulness when making something completely open for anyone to access is all the more important.
Not only that, but it was all horribly outdated. Seen some things running on rails 1 pre release on a debian server about 6 years passed end of life.
Its a wonder the world works at all.