In the "Where's the Fair Use" link I provided, it should give you an idea that a growing community in YT has been battling this. From small time video creators to big names like Markiplier, Nostalgia Critic (the one that made that video), Team Four Star, CinemaSins (I think
CS is, not 100% sure on that), etc.
It's a bit of an uphill battle that they seem determined to not be "silenced" about. Nostalgia Critic mentions (in the same video link above) an organization called EFF (Electronic Frontier Foundation). I'd check out the two links I provided, you'll realize that you aren't alone. Nostalgia Critic's video opens awareness about what's going on and what's being done about it. The copyright link I sent just gives a bit of insight as to how the whole thing works itself.
Another thing about YT is that its own personnel don't even have to look at the content being striked/claimed against. This is one of the reasons I don't even make YT videos anymore, but I am not shy about helping people with information that might
help them fight this. While I can't donate to the EFF (wallet is bone dry)... I'm very vocal about supporting it (as well as the big names that are taking a stand). The EFF has also sued the shit out of these people abusing the system in the past, as I've understood (Nostalgia Critic also mentions that, I think). Yet... the wrongful BS still continues. I'd like to think this is calming down, but it's hard to tell how this battle is going.
But really, check out the video. If anything, you'll know that people out there are fighting this.