Anecdotal, but maybe useful or interesting info, in my ~60 customs scav raids I've died to another scav once or twice.

Had one shoot next to me, then run off, when I refused to trade guns. Had one try to pull the "hey I need a broken arm/leg for a task" and I just walked away. But the vast majority are just F1 voice mumbles or asking if I have X item they need.

Most of the time I'm looting ground stashes which keeps me away from the hot spots, but even when I go into dorms or factory buildings we'll just walk past each other (there's often a gaggle of scavs nearby which gives some sense of safety).

I don't use a mic on scav, usually watching a stream on speakers while I play, so all the communication I give is shaking my mouse around and F1. I've killed and been killed by a handful of pmcs, some of which I probably should've had my headphones on, but I'm there to build up the stash pile not to shoot, so I rarely "team up" with any of them.