SoundStream presents itself as a music and audio player with community features, but it's missing the basic elements that help you decide whether a site is safe. The domain is a subdomain of a CDN, and there is no information about the people or company behind it. That alone is a warning sign for a platform that encourages you to create an account and post content.
Most legitimate music streaming or social audio services have an about page, contact details, and clear terms of use. This site has none of those. It also lacks a privacy policy, which is a legal requirement in many countries when you collect personal data. The site is very new — the Wayback Machine has never captured it — so there's no history to judge its reliability.
Is soundstream-dpev3yzhvt3p.edgeone.dev a scam? I can't say it's a scam, but the absence of transparency and compliance makes it impossible to recommend. If you're thinking of signing up, wait until the operators show they're serious about trust: publish a privacy policy, list an address or email, and explain who they are. Until then, treat it as a high-risk unknown.