DMCA is for user generated content on platforms, so microsoft wouldn't have a lot of surface-area to target. That said, youtube gives preferential treatment to the largest creators and companies. Apple and Disney could easily call up their manager Jerry at Youtube and deal with frivolous takedowns. Small creators often have no direct contact with a human at youtube and have X as their best option for contact. Unless they know the process and have enough money for a lawyer, they're shit out of luck.