Very true, even in PGs you don't know; just look at those who PvP in the Mobius PG which has a rule saying no PvP.
So PGs have that "unknown" factor just like Open does.
You can 2Ironman" in pen as well, so constraints are not just limited to PGs.
same for anything anyone does in PGs.
Face facts, you can use PGs as you use Open, and Open can be used in the same way PGs are.
They are exactly the same.
Actually joined a player's personal PG last night, and this was the first time I'd done such a thing. Actually had a good time TBH. He was mining some pristine rings, and I was watching his back. He seemed a bit wary at first (I was in my Corvette), but relaxed shortly after I arrived and went back to mining.
I do something similar in solo when I play guard dog for a T9 in a haz res, but this is different in that I actually could have a conversation with someone. Well, typed conversation anyway.
The only thing that could have ruined it would have been OP'd PvP ships showing up to attack us. Don't need or want that crap.