We fully agree with @refri here. The proposal seems sensible, even if spam is currently relatively low. But some reasonable process would be appreciated to tackle the possibility for unwarranted censuring.
…or an obligation to post the removed topics along with a short reasoning here.
The idea of posting removed proposals and the reasoning for their removal is attractive. The additional time/cost would hopefully be fairly minimal. Other actors in the DAO (e.g. delegates) could then provide a feedback loop by occasional reviews/spot checks, to balance the power awarded to moderators.
We would however advise flexibility. Spammers often post the same or very similar proposals many times over, in which case moderators should not also have to duplicate their efforts. In general, we advocate for strong, clear principles for moderation, lightly held to adapt to ever-changing circumstances.