How about limit new accounts?

  1. note comments by anonymous were disabled already due to a dedicated troll spamming single letter comments on repeat (mostly in Eastern Europe/Western Asia)

  2. I am using https://codeberg.org/matkoniecz/OpenStreetMap_cleanup_scripts/src/branch/master/script_assisted_cleanup/watchlist_for_new_notes.py 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 send me via PM 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)

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