Hi anon! Thank you for the question
First of all
Don’t panic!
According to the OTW’s legal department it’s the websites that will be held responsible for our uploading copyrighted content and not us. We would still be held responsible for the old laws, which contain important points on fair use, which protect fanfiction users.
That’s why they’re implementing the filters; worst case scenario you’re just not going to be able to upload and view fanfiction anymore, or you might simply be locked out of sites like AO3 because you’re European (is my guess).
Because of that we really do need to fight this thing with tooth and nail, we can’t entirely calm down.
So please, do share this with your readers and your followers, and everybody you know! And call and email your representatives!!
Again! Don’t panic! I know it’s easy to; I certainly panicked when I first heard! But there’s no need to delete your fanfiction just yet!