After Disney reneged on their deal with Robin, they tried to make it up to the actor by gifting him a Picasso painting worth more than $1 million. Robin began to criticize Disney openly in interviews, explaining why he was upset with the studio.
“You realize when you work for Disney why the mouse has only four fingers,” he said at the time. “Because he can’t pick up a check.”
In the sequel to the film, which went directly to home video, Robin refused to reprise his role as the Genie. Instead, Dan Castellaneta, who plays Homer Simpson, took over the role. Robin did return to the role for the third film, though, which suggests that tensions may have eventually cooled between the actor and the studio.
Source : https://www.distractify.com/p/robin-williams-disney-feud