Gerard Meijssen, 04/12/19 11:23:
Free licenses are not always possible, it is not as if a single scientist is the only one signing a paper and determining the license.
Nearly everyone can deposit at least some of their works as preprints under a free license.
What helps a LOT is for scientists to be open about their work, have a public ORCiD record so that we can import the data in Wikidat
Having the work open access in open repositories is often the first step to also have metadata about them in open data. Sure, researchers could learn to be librarians/cataloguers and wikipedians in addition to doing their research; most won't, though.
Federico