>>14356181
Naughty Dog and Insomniac were independent companies that entered into three-game contracts to create games for Universal Interactive Studios. These games being Crash and Spyro. Sony had the publication rights for these games, but Universal was always the copyright holder, and Naughty Dog and Insomniac were just employees.
After Warped, Naughty Dog extended their contract with Universal for one more game, and made CTR, but after that, they were bought out by Sony, were no longer an independent company, and would no longer be making games for Universal. When Insomniac's three-game contract was also up a year later, instead of resigning with Universal, they signed a contract to make a bunch of games for Sony, though were not wholly bought out by them.
Universal made one more Crash game on PS1 after Naughty Dog was bought by Sony, and this game was also published by Sony, like the previous four. So Sony still has the publishing rights to all the Crash and Spyro games on PS1, and this is why you haven't seen them on other platforms, even though they obviously could have been ported over the years. I wonder if the N. Sane Trilogy sidesteps this issue, and in effect gives Universal Interactive Studios (who were since bought out by Vivendi, who was since bought out by Activision) the rights to publish the original Crash games (albeit completely remade) on other platforms. But They seemed to work closely with Sony in making this, so perhaps Sony didn't let them do that.
Sony evidently figured that Jak & Daxter and Ratchet & Clank would do as well as Crash and Spyro. Ratchet probably got close to Spyro, but while Jak 1 was Crash in all but name, Jak II focus testers told them the Crash formula was too childish, so they started down other paths that eventually lead them to just making SJW movies with no gameplay.
Sony just doesn't care about this stuff. They also had Ape Escape, but they just shat out a bunch of minigame collections instead of main entries and then they stopped doing those too. Sly Cooper is maybe getting a tv show which would probably mean another game but after the Ratchet movie's failure they are being very cautious about it. Sackboy works better as a mascot than a playable character but they never really put it up front and center in marketing. It says a lot that a fictional businessman became a more popular mascot for that console than the character they seemingly intended to be one.