Is the sky blue?
Is water wet?
Such are the levels of mystery involved in these cases.

While one can argue that it is a herculean effort to attempt to whack-a-mole to take all of the copies out there, that is how the system is supposed to work.
Google doesn’t host the files, so sending them notices accomplishes nothing beyond being able to claim Google isn’t doing enough.
Trying anything else might hurt their bottom line, so it is easier to allow the content to remain out there and increase their profit stream from pursuing IP addresses and demanding payment from the name on the bill who might not be the guilty party.

They do this while it is clear from the downloads there is demand to see this movie now, rather than in 6-8 months when the sacred window release chart says it is the right time to launch it at a high price. They talk about the millions they are losing, because they refuse to compete in the market and satisfy consumer demand.
They are stuck in the old days of making money at each tier of release, even as more and more people are moving away from that model. They pray that cord cutting is a fad that will not catch on, because then they might need to shift the model and actually compete as the releases might no longer be staggered and the consumer might see something else they will pay to watch instead.