IMO, It depends on what you're after.
On the one hand, there's the prevent of (presumably) accidental posting of child porn on TRF; on the other, there's a point of principle in not supporting a site that promotes child porn.
I'd personally favour a ban.
I'd whilst mod approval would only cover the former.
I guess a link without embedding would be an option (if plausible) - and a board norm of describing/quoting what the link says would be a compromise position.