Really, report them they have to take them down, if they do not take CP down then make a hacker News thread , you for sure will be on the top of the page.
Telegram regularly takes down such channels too but their mistake? They underestimated the moderation team size and move at a slower pace than other trillion dollar corpos.
The main mistake seems to have been to ignore requests from law enforcement - and since these requests allegedly only numbered in the dozens, it's not a team size issue.