But publishing a public domain paper with a commercial publisher still makes little sense, unless the paper is also _open access_, for without the latter, the p

But publishing a public domain paper with a commercial publisher still makes little sense, unless the paper is also _open access_, for without the latter, the public domain document could still be put behind a pay wall. Just because it is owned by no-body does not create a duty for the publisher to open their paywall (unlike, for instance, the viral clauses of software licenses like FSF's GPL, which include language that actually forces sharing).