>>308295806
Some rando appeared in my friends only instance and neither myself or the one other person with me had him added. He said he just wanted to see what we were doing and then dropped a portal to a -24000/30 population great pug and left. Probably could drop in on a private instance too but I don't know what the UI looks like or how they browse through instances. The chance of it being you specifically if they're just dropping in on random ones is pretty low but I imagine there are ways of finding specific people on whatever client they're using.