[captbaritone]

I recall hearing that SQLite actually had some significant issues with choosing public domain as their license and somewhat regret the decision. Apparently it’s not a concept which has broad understating internationally, and there’s less legal precedent in a software context which has made it harder for some teams to adopt due to concerns from legal departments.

[shiomiru]

The Unlicense isn't "just" public domain though, it also has a fallback clause that explicitly lists things you are allowed to do ("copy, modify, publish, use, compile, sell, or distribute"). So I think the intent is, even if PD isn't recognized and line 1 is invalid, you're still granting a license to the same effect.

SQLite on the other hand just says

    The author disclaims copyright to this source code.  In place of a legal
    notice, here is a blessing:

      May you do good and not evil.
      May you find forgiveness for yourself and forgive others.
      May you share freely, never taking more than you give.

which seems less useful once you strike sentence 1.