All the songs I have copied to iTunes get uploaded, but if you have the lossless versions they get converted to normal quality on other devices, or if you remove the local original copy.
Music doesn’t support flac, though, you have to convert them to alac first.
I also use a Mac, I don’t know if it’s different on windows
feddit.uk was registered last June, just like feddit.nl. Feddit.de was changed in August 2021. Unless the domains were transferred, feddit.de is the oldest