A person with a intellectual disability will often be easier for abusers to manipulate and may not value their own well-being over the abusers approval

He actively wanted out as seen by the desperate text sent to his mother saying how he "felt like a hostage" that was read aloud by one of his abusers on stream, but due to coersion both financially and socially. In one of the streams his abusers openly brag about how if he doesnt participate in their "game" they'll take the keys for his car and his apartment until he does.

There's generally a lot of factors that add up to staying in an abusive situation. From his point of view its likely that there didn't seem much of an option for him outside of this.