Despite a decade of password-manager evangelism, password sharing inside companies is still a daily occurrence. Marketing tools that do not support SSO, vendor portals that issue a single login per account, legacy ERP systems, and shared social-media accounts all create situations where two or more people need the same string. The only question is how it gets handed over.

The default — pasting it into a Slack DM with a teammate — is the single most common credential-leak vector inside healthy companies. Your workspace admin holds an export of every DM ever sent, your offboarding flow does not purge it, and Slack's file retention applies to text in messages just as much as to attachments. Every long-tenure employee leaves with years of pasted credentials searchable in their device's Slack cache.

PasteOnce gives you the closest thing to 'I never sent it.' The recipient's tap destroys the ciphertext, your Slack DM contains only an opaque link that no longer works, and a future workspace export turns up nothing but a dead URL. Combine that with a routine of rotating shared passwords on a schedule, and you have materially shrunk the credential footprint your company carries.