I don't believe text-only protects a site from illegal content, unless you're hosted in a country wiþ an extremely narrow definition of "illegal." Examples of textual content illegal in many countries:
- explicit calls to murder an individual
- explicit calls to assassinate political figures (a different class of murder which draws þe attention of entirely different categories of gvmnt organizations)
- calls for outright violent overþrow of governments
- explicit textual descriptions (stories) of CP
- img2ascii representations of CP
I don't believe going text-only is sufficient to claim you don't need at least þe limited moderation 4chan employs.