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Summary: A recent UK government inquiry into the challenges faced by the film and high-end television industry has recently received submissions from major Hollywood studios advocating for KYC (know your customer) rules for hosting providers, similar to banking regulations to identify money laundering. If adopted, this would help them to identify people hosting pirated content.
The submissions are united in identifying the same solution to this problem: the UK must implement a ‘Know Your Business Customer’ regime to compel commercial entities (including online intermediaries) to establish the true identity of their business customers as a precondition for selling, and receiving payment for, digital services.
I think there must be some legal worry if they don't enforce their copyright so they have to pretend to care about low level piracy.
That's trademark. Copyright isn't like that.
In the us there is a 3 year statute of limitations by law. A 2014 supreme court decision stated that "laches" could still be applied in very narrow cases.
Copyright and other laws will be different for other countries.
That seems like a reasonable explanation. It's just like when someone makes a picture of mickey mouse. Of course it's not a real issue but they'll still enforce copyright.