"...regulating the way platforms deal with online illegal content touches upon the freedom of expression and therefore requires high standards of fundamental rights protections in democratic societies.(...)"
See: Meijers Committee: Comments on the proposal for a Regulation on preventing the dissemination of terrorist content online (COM(2018) 640 final) (pdf):
“The proposed Regulation contains far-reaching obligations to take proactive measures. These are not limited to detection of re-uploads of already removed content, but include the identification of new material (including by automated tools).”