Apply that to the US (328.2 million people) and we have that 18,116 individuals are responsible for 50% of problems.
Mic drop
Nothing about trouble.
But perhaps it would be clearer if restated as, "50% of impact in a domain can be attributed to square root the number of people in that domain".
There is an extreme minority of people who comment and up/down vote who drive the discussion of the whole. The 99% rarely participate and just go along for the ride.
And that's how genocides start.
Also, if you have any influence over which 20 people you spend time with, they're probably the 20 out of 25 who are not those five.
If 20% of people cause 80% of the trouble and this idea fixes that, then perhaps there is some merit in the idea even if you consider the downsides.
Edit: oh, and obviously closed source, and have it's entire db leak about once a year due to excellent security.