Poor piracy protection
The PSP lost a lot of legitimate software sales and a lot more third party developers as a result on account of the rampant piracy that hit the system after its launch. It crippled the software publishers, causing many of them to stop supporting the system, and the system's game library became increasingly diminished because of this. Sony seem to be combating piracy more effectively with the PS Vita, but they will need to avoid letting pirates off easy with the PS4 as well.
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