[stewartbracken]

Private relay is an Apple VPN-like service that only covers iOS safari. That means the SoundCloud app or desktop usage will not receive any privacy benefits.

[black3r]

Private Relay also works in macOS Safari.

[agiacalone]

Just tested Soundcloud with a PWA using iOS Safari and Private Relay enabled. It works fine, albeit a few annoying popups asking to download the app.