>>39853291first of all, >still getting ads in tyool 2022 (and yes, "b-but I'm on the phone..." is no excuse, there are adblocking solutions for that too)
Second, what you have to understand about "targeted" ads is that it's less about the advertiser telling youtube for example "I want my ads to appear on THIS content" (or even, THIS specific video, etc.), and more about the advertiser simply telling youtube (or whatever middleman they use) what AUDIENCE they want to reach, and this in turn influences on what content the ads appear (because that's what the targeted audience watches).
So for example, what's the audience a vtuber would want to advertise themselves to? Obviously the nearest reasonable answer would be "people who watch vtubers", as this is where you'd have the most effect (i.e. people who are already watching vtubers are more open and predisposed to also watch you, another vtuber, so you'd have a higher "conversion rate" (people seeing your ad, clicking on it, and watching your content) as opposed to people who don't watch vtubers in the first place). So you're simply telling youtube "advertise me to people who watch vtubers" (again, as opposed to directly telling youtube "put my ads on other vtuber videos lol", which is simply just a consequence of the initial request), and it's no mystery what happens next - your ads will appear on other vtuber videos, because that's where the intended target audience you wanted to reach is (vtuber watchers).
That's how you sometimes even get Niji ads on Holo videos and vice versa, and it's not because the managers behind it are so petty and cunning that they explicitly tell youtube "hehe, I'm want to put my ad specifically on my competitors video!!", because that's not how the underlying mechanism works exactly, which you hopefully now understand that it's just an occasional side-effect of the general phenomenon.