Considering that neither the authors nor the reviewers are making money from the peer-review publication process, any paywalling whatsoever amounts to nothing more than profiteering. It is simply a way for private companies to extort vast sums from publicly-funded institutions, just as we see with private contractors who take government tenders in infrastructure, healthcare etc. As she rightly says:
[The academic publication model] is very different from the music or movie industry, where creators receive money from each copy sold
As someone embedded in the academic "publish-or-perish" working environment, I welcome this, though I am skeptical of how long it will last. Download while you can, I guess.