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 It bloats the UTXO set increasing the cost of validation, among other things 
 This is nothing to do with Taproot or Segwit. You are very confused. 
 I have been a professional software engineer for 25 years and studying bitcoin specifically for 7.  I can assure you I understand the details of the protocol quite well.  If you do not understand how the witness section is abused to produce spam then you should study bitcoin more deeply.  I am not your tutor.