This has been on my mind for a while and I couldn't find a clear answer anywhere else. The old Java-based chat rooms are basically all dead. Everything has moved to modern web tech.
Blocking and reporting features matter a lot. Platforms that take moderation seriously are worth the small effort to join. Premium sexting platforms that tie to phone numbers are usually not worth the privacy risk.
Never share your real last name, address, or workplace before meeting someone in person.