Earlier quoted context omitted.
That's very true, but in practice these corporations argue that that particular paper is their copyright, not the research. Thus, just because the general public need to pay to access a particular document, that doesn't mean they are barred from the research.
Which is fine. Just that the public should demand that all research using public money is done openly, so all data and papers are accessible to the public in perpetuity. Researchers are welcome to refuse to accept that deal, just so long as they don't take any public money. Simples.
In some countries this is basically enshrined in law: there's a big table of journals ranked from high to low, and you need a certain number of publications in the high-ranked journals to keep your job with a public institution. Many of the high-ranking journals are closed access, for-profit.