This comment would be more useful if you have the name of the product or linked to it. I’m also not aware of this offering and wasn’t able to find information on it.
iCloud Private Relay (at least for Safari).
iCloud Private Relay
It's a very limited VPN as it only works for Safari/Mail and only anonymizes you to your region/country.
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.
Private Relay also works in macOS Safari.
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.
They’re not big enough and some sites will hard block it with other VPNs, like the government of Delaware. Bigger sites still soft block it like Instagram which will randomly ban accounts using it, or Google with captchas every couple of searches.