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Re:RPCS3 PS3 Emulator – January 2019 Progress Report by idonotknowwhy on Sunday March 17, 2019 @11:09PM (#19418432)
Sony don't seem to mind anymore, considering the Playstation Classic console uses the opensource pcsx emulator:

https://www.dualshockers.com/playstation-classic-emulator-pc...

Re:RPCS3 PS3 Emulator – January 2019 Progress Report by Tsubasachan on Monday March 18, 2019 @01:08PM (#19422890)
Sony doesn't seem to care about emulation of old systems. The reality is that old games doesn't bring in much money for them and the people who run emulators are a niche.

Piracy of the PS4 would get their attention.