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> What saved me was that the package was inside an organisation ("@foo/bar") and those are not free on NPM...

(Public) Orgs _are_ free on NPM (at least nowdays) so maybe even that wouldn't have saved you.

Then I am not sure what did prevent publishing, but it was not published.

npm orgs are free, but the org has to be created before you can publish to an org's scope.