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  • Pump and dump investors caused by lack of traditional regulation
  • Price volatility, especially notorious bubbles and crashes
  • Use as an investment commodity
  • A series of embarrassing security failures (notably Mt. Gox)
  • Use by cyber criminals
  • Technophilia by its advocates
  • Criticism of the anarchist or libertarian politics advocated by many of its users
  • Dysfunction of its centralised components, notably core development team and increasingly centralised mining pools