No one cares about his boycott calls. Did Florida's economy suffer due to his call for a Spring Break boycott of the state? What about FedEx, have they filed for bankruptcy yet over their refusal to drop the NRA? MyPillow defied him and Media Matters on the Laura Ingraham advertiser thing and were rewarded with big sales.
Hogg has no power to financially hurt anyone. He can only hope his social media noise machine can make them capitulate, and that's about it, if they don't, they're not going to be hurt by any long-term Hogg-led boycott.
Quite often those who rant against guns prove to be the best at getting guns sold.