Then they should shut down Tumblr. Every platform that generates UGC has to police their platform to remove child pornography, full stop. If they don't want to moderate their platform, then they should shut the whole thing down. They have to "subject their employees to having to police child pornography" regardless of the fact that they host legal pornography.
Twitter has plenty of legal porn without butting heads with this issue. Facebook doesn't allow porn and have to deal with the child pornography issue.
Taking the stance of "we banned all porn because of child porn" is lazy and deflects responsibility and agency of their actions. They banned porn because the suits higher up said they didn't like it, full stop. Trying to save face with the community and blame child porn is dishonest when every platform, from 4chan to Facebook, has to police and report child porn.
Twitter has plenty of legal porn without butting heads with this issue. Facebook doesn't allow porn and have to deal with the child pornography issue.
Taking the stance of "we banned all porn because of child porn" is lazy and deflects responsibility and agency of their actions. They banned porn because the suits higher up said they didn't like it, full stop. Trying to save face with the community and blame child porn is dishonest when every platform, from 4chan to Facebook, has to police and report child porn.