> Is this for like "making your own Twitch" or something, where streams have to scale to thousands-to-millions of consumers?

Yes, this can be a good building block for broadcasting data streams.

s2-lite is single node, so to scale to that level, you'd need to add some CDN-ing on top.

s2.dev is the elastic cloud service, and it supports high fanout reads using Cachey (https://www.reddit.com/r/databasedevelopment/comments/1nh1go...)