Since 2008, code collaboration has meant one company's servers. Your identity and your project history sit inside GitHub, and none of it is yours to take with you.
The AT protocol, the same one under Bluesky, changes the arrangement. Your data lives in your own account. It travels with you, and any app can build on it.
That makes the forge swappable and your reputation portable. It also fits what's coming: once AI agents are opening most of the pull requests, you'll want collaboration on open rails anyone can build on.
Five minutes on why the AT protocol is where this is heading.