The people you meet are simply whoever happens to be online. In practice that means South Sudan and its East Africa neighbours — Seychelles and Mauritius among them — mixed in with strangers from every other continent, which is a fast way to lose an hour.
English is the everyday language in South Sudan, so there is no warm-up phase — you can open with a normal sentence and get a normal sentence back. What does shift is the slang and the pace, which is usually the interesting part.
UTC+2 is the offset to remember for South Sudan. When it is 8pm there it is 10am in Los Angeles and 7pm in Lagos, and that late-evening stretch is when random chat is at its least rushed.
There is no charge. Every chat mode works the same for visitors from South Sudan as for anyone else in East Africa, and none of them sit behind a paywall.
Nothing beyond the 18+ confirmation. Video and audio travel straight between the two browsers over WebRTC — the same in South Sudan as anywhere else in East Africa — so there is no profile to create and no chat history attached to you.
Chats from South Sudan run in English from the first line, which makes this an easy place to start if you would rather not handle a language barrier and a stranger at the same time. Evenings there — 8pm at UTC+2 — are when those chats run longest.
Around 8pm in South Sudan, which is UTC+2. From Los Angeles that means 10am, and from Lagos, 7pm. Earlier in their day you will still get matches, just fewer from that part of East Africa.