The V-League.pro developers have added a plot showing the distribution of players by league:
https://v-league.pro/stats/players-by-league
An interesting observation is that there are many more Super Silver players than Silver players, despite Super Silver being half the range of LPs compared to Silver (2,000 - 2,999 vs 3,000 - 3,499). It is also surprising that there are fewer Ultra Silver than Gold players, and fewer Ultra Gold than Platinum players.
I suspect that part of the explanation is that people tend to stop playing ranked once they've reached a new league, and that the amount of LPs won and lost is strongly determined by your and your opponent's league. For example, as a Silver, you lose more points to an Ultra Bronze than you would to another Silver, even if the difference between your LPs is insignificant. That Super Silvers are much less likely to be matched up against Bronze players of any kind would further amplify this difference.