>> Maybe you could do something cumulative and Kickstarter-like where there's a threshold for the article to be unlocked and anyone can chip in to getting it over the line. This would take advantage of human psychology that we like being part of something bigger than ourselves.

This sort of happens with Substack, albiet not as explicitly. People become "Founding Sponsors" or "Paid Subscribers" and they effectively subsidize it for everyone else because they appreciate the author's work and want the author to succeed. Authors often want to give away the content since it is indeed better if everyone can read it (as you note) -- but often cannot sustain it without a minimum set of sponsors.

I think you are speaking about this happening at the article level rather than publication level, which seems pretty hard since the readership would be fractured and long-tailed.