I remember learning the bloods sign in middle school, but are gang signs thrown around often that they need identifying? Maybe this can be a pitch to MLB teams

I remember learning the bloods sign in middle school, but are gang signs thrown around often that they need identifying? Maybe this can be a pitch to MLB teams to learn the opposing team's catcher's pitch signs? If it wasn't only hands, not sure if this could offer anything to analyzing third base coach signs as well.