Yeah, that's it. Randonautica was a thing that schlocky mystery youtubers like Nexpo were pushing about a year ago. You start it up, it geolocates you and shows you a Google Maps overview of your area, it asks you to think hard about... whatever, and then it gives you a random location and says you'll find something there. No actual indication on what you're supposed to find. It's tailor-made for internet-fame-seeking teenagers to get excited about and then fabricate something interesting they found to draw in views.
The people-getting-killed thing prob relates to how there was a story of someone finding a dead body via that, and it turned out to be a hoax, of course.
I actually tried it, and it's impressive with how relatively simple the app is. It just plants a random coordinate for you and tells you to go there and that's really all it does. I tried it in my city, and it gave me a part of a freeway that I really couldn't get to safely (lmao); and then a parking lot of a store that closed before Coronavirus. There was absolutely nothing interesting in this parking lot, of course.
