You are right. But you can tweak incentives to make it closer to “one distinct human”. Let’s say in your next installment you have the choice to either participate with the same principal again or with a fresh principal. If your “score” grows faster than linear with multiple participations of the same principal then people are incentivized to do that rather than creating a fresh second principal.
Let’s say first participant gives you 1 point, second participation 2 additional points, 3rd participation 3 additional points, etc.
There should be a cap of course. Say it caps out after 5 parties at 1+2+3+4+5=15 points. In the presence of a cap you also need a decay so that it is always better to keep participating with the same principal rather than starting a fresh one with 1 point. For example, you can say if you miss out on a party then you lose the points that you got from the party before. Here, if you miss the 6th party then you lose the 5 points from the 5th party and are back to 10 points.