100K websocket user broadcast

I have an application with about 100K concurrent users needing second-by-second updates of a global state via websockets.

I can't find a clear solution on Cloudflare. I do see that Durable Objects might be suitable for long-running websocket connections, but I imagine that'd only be suitable for 1,000 or so users, and Is there any automatically distributed system that allows users to connect via websockets for broadcasted events?
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