to repeat How about limit new accounts? - #181 by Mateusz_Konieczny
I am using OpenStreetMap_cleanup_scripts/watchlist_for_new_notes.py at master - OpenStreetMap_cleanup_scripts - Codeberg.org to deal with some trolls/vandals/test edits. Maybe there are some phrases (like one in top-left note?) that appear repeatedly and never in valid notes? Allowing notes to be closed (and reviewed after closure by human, still faster than catching it manually).
If you list some repeated insults that never ever will appear in useful notes then I can add to what I am closing semi-automatically (see Notes submitted or commented on by Mateusz Konieczny - bot account | OpenStreetMap for what is closed, notes after closure are reviewed)
Also, feel free to use that script and close all anonymous notes in this specific area (and reopen ones which were valid), I did it with some vandal attacks (someone was creating hundreds of word salad notes in a specific town). But that requires knowing local language to reopen valid notes made by unrelated users.
DWG has similar script that outright hides anonymous notes in specific area.
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