They get away with it because they claim it was a simple machine/software error so they were innocent. But just on my channel alone, they issue a dozen claims against the same public domain movie every month. And if they're pulling that shyt on my channel, you know they're doing it to thousands of other channels too. They have to know about this repeated error by now, & could have easily fixed it. But these "errors" are very profitable for them so they have no desire to fix them. Why should they? It more likely they created these errors to make false claims in the first place. That way the machines get the blame of false copyright claims, instead of them. But they get to keep all the ad revenue & other money made by the claims anyway.
When a false claim is made at a youtube channel, even while the claim is disputed, the claimant gets a large percentage of any ad revenue generated by that video, & also gets to run any ads they want with the video. It takes an average of around a month for the false claim to be resolved. But when that happens, they just have their bots scan your channel again, & make new false claims against the stuff all over again.
And they got us by the balls too. If they deny your dispute, if you challenge the denial, it's a strike against your account if the challenge is denied. If you get 3 strikes against your account you loose all your adsense, google, & youtube accounts for life!
So the whole system is set up in favor for the copyfraud crooks to win, & for anybody who tries to fight them to fail. It's set up to discourage & scare the crap out of anyone who wants to dispute these mobster's claims.