There is a free and open source python library that you can download and use called Spleeter:
https://github.com/deezer/spleeter
There are some online programs that do this as well, but they usually cost money or only allow a few splits. Check out Ezstems or splitter.ai. Server costs for AI splitting aren’t cheap, so it will be hard to find a free and unlimited online option.
I’m actually working on a web version of Stem Player right now, just for fun. I have the main mode done, but I didn’t realize how complicated all the modes are, plus web audio is a whole new world for me.
Haven’t gotten my stem yet but it shipped today so it should be here Wednesday or Thursday. Someone else said it works that way here’s the link for the adapter USB-C Female to USB-A Male Adapter,Compatible with Apple MagSafe to USB Wall Plug,Type-C to A Charger Cable Connector for iPhone 13 12 11 Mini Pro Max,MacBook,iPad,Galaxy Note,Google Pixel 5 4 3 2 XL https://www.amazon.com/dp/B08W2TP2TT/ref=cm_sw_r_cp_api_glt_fabc_1AH5PV0C5F46F3S5YHT3?_encoding=UTF8&psc=1
Seems to me that it would allow you to load songs that are already split (and much cleaner). The songs you upload to the song-splitting "platform" likely won't sound much better than what Moises is doing.
Either way, the true value in the Yzy Donda Player would still come from the long-term access to its song-splitting "Platform" site. Existing song-splitting services like Moises or LLalal require payment and subscriptions (and don't come with a nifty stem player).