That's a naive interpretation of state of things. Timestamp aspect can be simply fulfilled by putting your pdf online and let google (and wayback machine) index

That's a naive interpretation of state of things. Timestamp aspect can be simply fulfilled by putting your pdf online and let google (and wayback machine) index it. "Publishing" as understood in academia is very different. It's about publishing a paper in a "high impact" journal and has pretty much been devolved to a grade card for the working scientist.