This is the best data I have seen for Splinterlands active players!
From your charts I see these main conclusions:

1. Modern has around 2000 players with about 600 players in Gold 3 and above and about 1400 in Silver and below which are not serious players... So we have around 600 Modern players.
2. We have around 2000 players in Wild some of which could be the same players from 600 in Modern. About 1,750 decks playing in Wild and they are at least Gold level decks judging by the rating they get.
3. Brawls add active accounts, I think of these accounts are no longer active in ranked but come to play in brawls.

I am surprised that there are so many unique players in tournaments, are you sure that is correct? I have not played in tournaments for ages...

This data is a gold mine, hopefully you will continue posting it...