Both Warner Music and Sony Music Entertainment have asserted copyright ownership of things they do not have any claim to, and have gone about removing it, taking away public access to it, and attempting to profit from it through advertising revenue where it is available.
This is not an administrative oversight. This is a business strategy. They’re not just deleting their own music through neglect – they’re actively seeking and destroying everyone else’s wherever they think they can get away with it.
Some how the infringement by beneficiaries seems more odious, particularly when they are the boosters for more draconian enforcement for the rest of us.