Usually the user has gotten his winning money from the casino then the user no longer cares about the discussion of the accusation whether it has been resolved or not... The fact is that there are still many users who just leave without changing the title to “resolved”.
The casino has to make sure the user locks all accusations threads he opened against them and mark them as resolved before they let him withdraw his money.
that's a good suggestion and can clear the name of the casino. besides the accusation thread, sometimes there are problematic users who also make reviews and give bad ratings on review websites that include the casino's name.
casinos might be better off doing something like that to limit users who make accusations and then leave their accusations when the case is over without giving a final statement and then locking the thread.