Doesn't start entirely organic but it ends up being nearly 100% organic hate for certain topics.
Useful idiots start parroting hit campaigns and it becomes "common knowledge" for them which they repeat whenever the topic comes up, creating more useful idiots.
See any "controversial" topic here. Eich/Brave, Elon/Tesla, Facebook/React. It's all the same talking points, some being years old, most being purely emotional/subjective.
If you respond back they'll just call you a paid shill or troll, but if you don't respond back the echo chamber goes unchallenged and makes more useful idiots to parrot those same talking points to restart the cycle.
Funny you mention Nickleback, it was the first time I noticed the hive mind hate. Personally they are a really good band and everyone I know (outside of Reddit) likes them and knows pretty much every single one of their songs, wonder who Chad Kroeger pissed off.
Bezos is not that. It's maybe a bit exaggerated where it might seem like people think he's the worst person, but in reality he's just a name that everybody knows who most people think is a bad person on multiple levels - but the approach to management of quantifying everyone and treating them like machines so that they have wild turnover is something that a lot of people all agree is awful and repugnant.
I'm sure if you want to understand why Musk is hated you can google it, but he clearly courts controversy and tries to get attention by saying outlandish things and it usually backfires. His handling of twitter seems toxic to a lot of people (Just work crazy hard and sleep in the office or you suck!). Then there was the sexual harrassment too right? He never apologizes for any of it that I've seen. Also there are accusations he's manipulated stock prices for a meme. And at this point I think a lot of people think he's too chaotic/random to believe what he says afterall, even if he gave an apology.
Gates is a good counterexample. Either of these people could act like Gates and be less hated.