The Superstonk sub. Just the word ‘lemmy’. I tried editing some comments (which already mentioned lemmy, and had links to lemmy instances and communities!) … and the edits resulted in those messages to my inbox.

They definitely are afraid of hemorrhaging control of their narrative. Unsure when exactly they added a generic filter for this keyword, but the fact the comments were already there, then the edits I did today triggered it, means it happened within the last month.