I don't recall hints to the theme being totally off limits in the past. It was all a matter of judgement.
The seismic event, the cat among the pigeons, that started the whole unpleasantness of the last four months was the posting, in Listener 4464 ' Dream Match' at midsummer (19 June 2021), by a newbie, misled by the thread's title and obviously oblivious of the tacit 'Rules', of the theme in its totality, lock, stock, and barrel - viz:
A Midsummer Night's Dream ACT II SCENE I
TITANIA
"The nine men's morris is fill'd up with mud,"
The result was an initial stunned silence.
I'm sure this post was entirely the result of naivete and, frankly, an understandable confusion from the titles of, and preambles to, the threads, and in no way mischievous in intent.
However, nothing was the same again, the ambiguities in titles led to angry questioning of the 'Rules' - in reality largely a tacit system of etiquette - right up to the recent forced expulsion of one contentious poster - but he did have a point: while ANSWERS are no longer misleadingly advertised, I for one am still not clear whether ANY reference to the theme is, or should be, forbidden - and it's clear to me that this uncertainty is shared by other commentators.
Whether it's possible to write a simple, clear comprehensive set of rules acceptable to all, for the conduct of the ideal one single thread; or whether we go back to rather uncertain reliance on an unwritten tacit system of ethics, is the question - and if the former, who is to bell the cat?
Norah, as an admitted non-crossworder, is clearly not able to do this, and it should not be expected of her - is there a constitutional lawyer among us who could volunteer?