You cant really judge whos the most active in the forums by points because some people just spam in notes and get hundreds of thousands of points in it.
Exactly but technically we can judge the most active player as its technically hikaru who has the most games
Allow me to introduce you to @PokerBloke99
He has played TEN TIMES More than Hikaru. about 400k
Yeah in both games and active but pokerbloke is not that active
He is not active in forum, but u asked most active on chess.com, so no one is near him in number of games and most hours on chess.com.
He has 400k+ games, while Hikaru only have like 40k.