Because copyright monopolists have trillions of dollars which they use to pay lobbyists and essentially buy laws such as the DMCA which says that you can issue

Because copyright monopolists have trillions of dollars which they use to pay lobbyists and essentially buy laws such as the DMCA which says that you can issue a take down and it's up to poor sap on the receiving end to either submit or fight a costly legal battle to prove not just their innocence but their bad faith.