You can take any AI agent (Codex, Gemini, Claude Code, ollama), run it on a loop with some delay and connect to a messaging platform using Pantalk (https://github.com/pantalk/pantalk). In fact, you can use Pantalk buffer to automatically start your agent. You don't need OpenClaw for that.

What OpenClaw did is to show the messages that this is in fact possible to do. IMHO nobody is using it yet for meaningful things, but the direction is right.