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.

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.

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.