My first encounter with the concept of bomb fishing was the Shapoklyak episode of the soviet cartoon Cheburashka, produced in the 70s. It's been around.
Blast fishing has been practiced since at least early 20th century. Essentially everyone knows about it and understands how destructive it is, no social media required. Some people just don't care.
The thought of the fishermen watching tiktok on how to poach is ludicrous. They're perfectly aware about this method and its high illegality. It might be new to some HN readers who aren't going to do this anyway, though.
>how to
Dynamite goes into the water, fish goes belly up, 90% of the catch is lost. It's not rocket science.
I wouldn't be surprised if social media was spreading this technique as successful way to fish.