Carlin co-founded RSI in April 2012 and also helped launch the Rush Street Gaming business in January 2005.
Carlin stepped down as chief executive of RSI in August of last year, making way for Richard Schwartz and taking on the new role of vice chairman.
However, RSI said that Carlin resigned from its board and any other offices, committees and positions that he held with effect from December 28, 2021.