According to the NBA’s release, the indefinite suspension “takes into account Green’s repeated history of unsportsmanlike acts.”
https://www.youtube.com/watch?v=x8T68yAU-qw
“Green will be docked $153,941 per game if his suspension is fewer than 20 games and $202,922 per game if more than 20 games.
Green’s three ejections are tied for his most in a season. His first came after he picked up two technical fouls against the Cleveland Cavaliers on Nov. 11. His second occurred against the Minnesota Timberwolves on Nov. 14 when he put Rudy Gobert in a headlock. The NBA suspended Green for five games after the latter incident, with the league citing Green’s history as a repeat offender for the length of the suspension.”