Are you being intentionally dense or do you not understand that it’s my point? If someone can flood lemmy with CSAM so easily that the only way to stop it is a site shutdown, then there are not sufficient mitigation measures in place.
Yes, this is the Internet. Take your statement and replace “lemmy” with “reddit” “facebook” “9gag” “imgur” etc… No site has “sufficient mitigation measures in place” as CSAM continues to flood the internet.
“Flooding” a site with CSAM is a matter of opinion. If one person posted one image of CSAM on my instance, that would be flooding - that’s one image too many. It’s not like there’s some magic threshold of the amount of CSAM allowed on a site. All sites use human moderators to detect CSAM and all sties who do this have teams that are far too small and far too underpaid for the most part.
Underpaid being the keyword here, as lemmy admins are volunteers. I would think that the threshold for “flooding” a lemmy instance with CSAM would be far lower than that of a major for-profit site.