https://www.polygon.com/2018/10/29/18038052/5-reasons-why-the-playstation-classic-is-missing-classic-playstation-games

Today, Sony revealed the complete lineup of games included in the PlayStation Classic. The 20-game collection has been met with a lukewarm reception. Where Nintendo’s recent plug-and-play retro consoles include best sellers, critical darlings and cult classics, Sony’s hardware has many glaring software omissions.

Sony was perhaps doomed from the start in curating a perfect lineup for the PlayStation Classic. Let’s walk through a few potential reasons why the PlayStation Classic is missing so many of the console’s standout games.