One of the most critical aspects of the DMCA is the "Safe Harbor" provision. This protects Internet Service Providers (ISPs) and platforms—like YouTube or Twitch—from being held liable for copyright-infringing content uploaded by their users.
The Digital Millennium Copyright Act (DMCA) of 1998 acts as both a and a sword for the internet, providing a legal framework that balances the rights of creators with the operations of online platforms. The Internet's Legal Shield
Without this protection, platforms would be forced to pre-screen every single upload to avoid massive lawsuits, which would effectively cripple the open nature of the web. The Mechanism: Takedowns and Counter-Notices