Couldn't they use something that made more sense like OpenKeystore or OpenKeyvault? I know Hashicorp might be sensitive about them using the word Vault though, I just feel that it should be descriptive more than a game.

At least to me, both of those imply a key-value storage system, not a secrets manager. `OpenSecrets` maybe implies less security to some, and developers tend to want to give products they work on a creative name.

Afaik it is in the spirit of OpenTofu. OpenSesame would have been fun, but a interweb search reveals it appears taken.