PVP existed in MUDs long before UO was a thing.
I did, however, play Trade Wars and the PIT on BBSs in the 80s...
I recall smoking pot while playing trade wars in about 1991 or so... and I was trying to corner the market on grain, but instead of buying all the supply with my massive bank roll, I accidentally sold all my grain and screwed up my position on the galactic totem pole.
I played some MUDs during university in the early 90s, but once I realized how much time I was spending on them, I decided I needed to stop for the sake of my grades. Of course, getting the original Civ game right before exams one year wasn't a good thing either from that perspective.