During the early career of Ursula von der Leyen (current EU president) in Germany she was championing a law just like that. It was something like "stop signs" for the internet and was based on DNS based blocks. The law was passed and was quickly overturned once her party won the election. During the campaign she and her party were denouncing everybody opposing the law as being friendly to csam. This feels like a bad re-run of the same script to me.