I have not looked into it very deeply yet, but as I understand the Bluesky project, this would not be as easy for Bluesky as it is for Twitter and Reddit.
You can use your own domain as your identity. Even when you use a service like bsky.app, you can use @yourdomain.com as your handle. And switch to any other service to publish under the same handle.
You can use your own domain as your identity. Even when you use a service like bsky.app, you can use @yourdomain.com as your handle. And switch to any other service to publish under the same handle.