If you verify your account, Bluesky will now reserve your default username for you. But this feature is not retroactive so what to do when you’ve already verified your account and have a placeholder or someone else snatched away your (original) default username?
https://www.libelcom.com/how-to-verify-your-bluesky-account-and-reserve-the-default-username/

How to verify your Bluesky account and reserve the default username | Libelcom
When I finally got three invitations to join Bluesky last year, I eagerly created one account for my cat, myself, and my business, Libelcom. Soon, I discovered Bluesky was a ghost town with bare-bones features. So, I just used my three accounts as placeholders. 3. How to re-verify your Bluesky account with a placeholder account
