But…does it sync?

You are right. In principle, the AT protocol is designed for federation. But at the moment, there is only one Bluesky instance that everyone is signing up on. This makes it effectively centralized like Twitter. It is mind-boggling that people are ignoring Mastodon for this.

Valve was founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington.

You have no idea how this works.