I don't think the DMCA replaces the scary letters. The scary letters existed because they were more effective than the DMCA. Threatening to sue someone is alway

I don't think the DMCA replaces the scary letters. The scary letters existed because they were more effective than the DMCA. Threatening to sue someone is always and always has been totally an option. The reason scary letters don't get sent right now is because it's easier to just have Youtube remove the video. If that went away the next easiest option (scary letters) would happen again. DMCA or not.