Piracy is a controversial subject but it really depends on how you see it. Its good for game preservation as we are currently heading towards a all digital future where games get delisted such as MGS & physical copies are going up in price or the game is digital only and we have no way to play it.
Personally speaking Marvel Ultimate Alliance 1&2 on PS4 are no longer available. They were digital only & they were never dumped. I have these games on my PS4 on 8.0 FW & their is a demand for them. If a eggsploit is released soon as current news suggests. Would you sit on them or let everyone else enjoy them,
I mean the legal argument would be if you own the game... then you can back it up because there are homebrew apps that let you do that... but a large majority of the users on CFW just pirate the games. All backups basically comes from someone who bought the game and they posted it on the net.
Piracy is best used at your discretion. But never forget this it's no point of downloading a million games if you will never play them in your life because many people are guilty of doing that. That's why nowadays I lean towards of playing the games I own one at a time so I can enjoy them.