The spirit of the search term is very much alive. You can obtain legal free alternatives (S900 Sessions), DIY your own library from your hardware, or convert old SoundFonts into modern Kontakt instruments.
Bookmark Pianobook.co.uk and check the "#rompler" tag weekly. New, legal, free Kontakt instruments that emulate the Yamaha PSR-S900 appear there more often than you think. Disclaimer: This article is for educational purposes. Always respect copyright laws and software licensing agreements. The author does not condone piracy or the distribution of copyrighted Yamaha samples. yamaha+psr+s900+kontakt+free+download+updated
Start with the "S900 Strings" or "MegaGuitar S900 Free" on Pianobook. Combine that with Kontakt’s own effects. Within an hour, you’ll be producing tracks that sound like 2007-era pop and EDM, all from within your modern DAW – legally, safely, and for free. The spirit of the search term is very much alive