I reported a drug bot yesterday, and it's taken down already. It's weird that the Dutch government is ignored like that.
I tried Googling (without knowing Dutch I found these: https://archive.is/dGp2w https://www.inhope.org/EN/articles/tackling-csam-hosting-in-... ) and I guess the difference is that I'm talking about public bots/channels, and the problem lies with private chats / groups?