I don't Litestream does that yet? It appears to be for backing up to S3, and you manually "restore" the image to a file. You can't point an SQLite client at the S3 bucket, and there's no provision for getting low latency updates. But it sounds like they're working on this.

Turso looks cool and is a project I will keep an eye on, but it's replica mode seems to be designed for apps rather than mechanism to rapidly scale out read replicas in a server cluster. Also, the web site warns that it's not ready for production use.