A lot of people just play chess casually. They create an account, play a few games and realize that they really aren't very good Or they get on, planning on learning to play and get overwhelmed. Or just have trouble figuring out the site.
Sometimes people that have been here for years and were active, will stop coming. They either stop playing online chess, move to some other site, or are just taking an extended break. Sometimes they'll come back.
I'm guessing a least 20% of the accounts are relatively active.
according to chess.com there are over 15 million members on this site but it appears less than a million are active. This is probably people who have created an account, played a bit of chess then left. so why have so many people left? it's not because of the the flaws on the site because although chess.com isn't perfect, it doesn't warrant 14 million people leaving.
so how many people are active? (my guess 100,000)
and why so many of the 15,000,000 have vanished?