Do we need to setup websocket for streaming document changes?

[sreekanthedayar]

I've been exploring BlockSuite and noticed that while it uses Yjs and CRDTs for real-time collaboration, I couldn't find any references to WebSocket usage or a sync provider like y-websocket. Most documentation mentions CRDTs and streaming, but it's unclear how real-time updates are shared between clients.
Does it rely on a built-in sync mechanism, or is it expected that developers provide their own?
How does the "streaming" mentioned in the docs relate to actual networking or sync transport?