The voice-chat social platform skyrocketed in popularity last fall, largely due to an influx of Black users. But we’ve heard this song before. — It was the night of December 8, and a group of Black users on Clubhouse were threatening a boycott. Meezy, 21 Savage’s manager, had created a room on the voice-chat app expressly for that purpose; from its virtual “stage,” he proclaimed in his vehement rasp that he was willing to…