Recently, both YouTube and Twitch have taken a public stance against the EU's pending Copyright Directive, an update to copyright law that's aimed at funneling money back to copyright holders for copyright infringement over the web but which opponents say will have a number of devastating consequences.
In a nutshell, the Copyright Directive is a major overhaul to the EU's copyright laws that attempts to modernize them in the wake of the technology boom. The most controversial aspect of it is Article 13, a section that effectively puts heavy legal liability on websites for any content that could infringe copyright.
That doesn't just include content the website owners put there, but also makes the sites liable for user-posted content that may infringe copyright, including things like text, sounds, music, or images. Sites would need to implement filters to catch copyrighted content and block it from appearing.