one doesn't hinder research, the other does
https://www.nature.com/authors/policies/license.html
Standard practice in the modern AI community is preprint to arXiv first, then out to a journal for review. All the papers are free online before they even go to Nature. So this policy does not stifle or hinder research.
They also do not take copyright - it stays with the authors - unlike other giants such as IEEE.
To my mind the legitimate argument is about publishers taking undeserved profits from unpaid labour while adding little value.
(edit: reordered sentences)
That argument also comes down to hindering research. Funds that could otherwise be used for research are now used to buy subscriptions to this journal.
The journal business model usually requires restricting access to the research, while the conference business model still works when the research is free.
It's also interesting to hear other people's talks that serve as a "teaser" for what's in the paper.
Strategy: publish in the high-impact established Nature-family journal, but publicly boycott the no-impact new Nature-family journal. Win-win.
edit: added -family suffix to clarify that I completely understand these are two different journals from the same publisher.
edit 2: I now understand why the editor of the new journal was hitting senior people up for personal meetings at ICRA last week. He didn't want to hear about our work: he wanted hints to help him on positioning.