THERE ARE NO ANTI-DRONE SYSTEMS FOR BIG EVENTS & PUBLIC SPACES YET
That's literally untrue, jamming and net guns are in use all the time for large events. It's not super standardized but they do exist.
Jamming is useless if it's autonomous. And over the decade+ I've been in the multirotor business, every net gun I've seen was shot at small stationary targets or larger barely moving targets. You would never hit a fpv sized quad going 60+mph.
It's not entirely useless, the ones I've seen also jam the GPS signal.
They don't need GPS is they're using visual data to track a target, you know, like the thing the article is about. The military would be useless if all you had to do was jam GPS in order to kill any active targeting munitions.
Shotgun, 12ga, birdshot, no choke. Maybe Federal Flight Control shells. Tough shot if it's moving laterally and more than 50' away (esp. with no choke!), but a pellet through the right place is going to knock it down, or mess the controls up enough that it's not functional anymore.
You definitely want something a bit longer than a trenchgun for this though.
A game you say? Possibly The Most Dangerous Game?
I guess if you threw in a few Trump, Gaza, and Putin references in the title, it could be more clickbaity.