My understanding is they also must restore the content when a counter notice is filed by the alleged infringer (but I'm not a lawyer).
Also, there's allegedly a loophole where the claimant can notify the provider's DMCA agent they're suing you, at which point the provider is obligated to keep the claimed material inaccessible, but then not actually sue you. I'm not sure this has actually been done, though.
Abusive bot makes fraudulent DMCA requests against your account. Your bot automatically files disputes. Abusive bot automatically verifies with youtube that they are the owners of the content, because they say so. Your account is demonetized and/or shut down for multiple dispute violations.
The entire system is rigged so the abusive bots have more or less free reign as long as they're backed up by some big media cartel. Google really doesn't want to anger said cartels who have been more than willing to sue individual people for trillions of dollars for sharing a single CD. Google has never been sued by creators for letting media cartels steal their works. They have no incentive to change policy at the moment.
Let's make software that generates content that to the big-media-bots looks like their copyrighted content, but to a human arbiter looks like anything but. This can be done automatically, by continuously gauging the response of the bots to variations in our generated content, and adjusting accordingly.
We'll spray this content all over, using throw-away accounts. Then dispute all the claims. Could we increase the volume of all claims n-fold this way? If so, at some point this would have to affect the trustworthiness of these bots with Google.
I refuse to accept that there is no way to fight back. If we could abuse the system in some way as to make this a problem for Google, I believe change can be achieved.