Depending on the age of your kids, I suggest total YouTube curation. I've only got up to a nine-year-old but I'm thinking it's going to have to go up to at least 13 or 14 before I can have a serious discussion about just what is out there and how people are trying to manipulate them.
Five years ago that would have been more to avoid them from stumbling across the various types of adult content that for various reasons I would have preferred them not to view, and perhaps the HN zeitgeist would have called me a puritan (although I'm not just thinking sex and violence here, but also things like conspiracy theories and politics they are currently incapable of processing and other things [1]). Now, unfortunately, it's more about avoiding the brain hackers that you describe that know how to hack their brains into getting low-level addicted to that sort of garbage, and now perhaps the HN zeitgeist will be less offended at my policy that a poor defenseless six-year-old or nine-year-old in my case can't be expected to defend themselves against this level of sophistication.
(Because however stupid those videos may strike you as an adult, they are sophisticated, in their own way. The "cartoons that were just toy commercials" of my youth were nothing compared to what modern kids are being targeted by.)
The good news is that we're actually finding some channels where we have some common ground. For instance, they're really digging Homestar Runner now, and I've got some others that I can pick and choose from that we all like.
I increasingly pity the "digital natives" that didn't get to ease themselves into this world like I did. I'm not saying they're hopelessly lost; today's article about kids rebelling against social media is heartening. I'm just saying, I had a much easier on-ramp than they did. My first few years worth of youthful indiscretions are now utterly obliterated, because the dial-in BBS they were on is now long gone. I wasn't fucking up on Facebook or where the Internet Archive could find me. By the time I got on to the real internet, oh, I'm sure I could find things that would make me cringe now, but I'm pretty confident I wasn't blowing my foot off anymore.
[1]: Oh, and I'm pleased to say that they both seem to be on track to be voracious book readers, which I think is the strongest Step One to being able to deal with the onslaught they will eventually face. My strategy here is not just mere "denial of access", as I am well aware that doesn't work into their adulthood, and my goal is to raise good adults, not good children. I'm still feeling through what my strategy is, on what is shifting sand anyhow, but there's more to it than just "shield them forever."