It's not just YouTube that's automation obsessed. The groups filing the DMCA takedowns are also automatically scanning and flagging content on YouTube.
The vast majority of content YouTube removes is not due to DMCA requests. It's pretty dumb to file DMCA requests with YouTube, because their manual claim process is easier to do and operates outside of the legal framework of the DMCA.
If YouTube actually followed the law instead of making up their own bullshit system those people could be sued for damages in court for filing false take down notices!