The thing is because of social media plus youtube plus Tekashi and YSL, all people know is RICO, but there's other federal offenses that could apply to any of these situations, but there's probably a reason why it hasn't happened. The reasons is most likely they don't have anything on them.
Federal murder for hire, federal conspiracy to commit murder,
and murder in aid of a drug trafficking offense is a crime, (that's what the JMJ one is, pretty sure)
RICO is in some ways death by a thousand cuts, esp. when used on street gangs, like YSL. Like the YSL is a lot of light weight charges, weed in a car, gun in a car, stealing a car, shooting someone 10 years ago-- They tie in all these offenses that by themselves are harder to prosecute, or harder to get that much time for. And as a way to link higher level shotcallers to street level violence, which they insulate themselves from.
I think it's rabid speculation that Yo Gotti and CMG get charged with anything. He hasn't been linked to drugs in like 20 years. He hasn't been directly linked to violence in like 14 years, since that club shooting.