That's a pretty broad statement and very clearly isn't true. Not "everyone" knows the risks. People gamble, invest, and spend money on things all the time without bothering to learn the risks. There are still people who thinking vaping nicotine is less addictive than smoking cigarettes, still people losing their life savings in Vegas.

And you might make the claim that they're idiots who are the exception, not the rule, but I'm not sure the stats agree. Either way, there are plenty of folks who would gladly take huge risks without truly understanding the stakes, and if even one of them has seen this dude's vids and rethought their next move, then he's done someone a serious service.

Another YouTuber, Ann Reardon, started with just cooking vids, then started debunking fake viral cooking hacks, then branched out into debunking or challenging other trends. She covered electric wood burning (I feel like there's a name for it but it escapes me right now) and how and why certain how-to videos were immensely dangerous. People died replicating them, and many other people chose not to because she shed light on that.