Donations hasn’t been a successful path for the wider internet, no reason to expect any difference here. Ads embedded in the images, or perhaps listen to a message from our sponsor while we prepare your PDF?
replyDonations likely won't work, but a combination of realistic publishing fees that do not enrich a publishing house plus government sponsorship (which would sort of happen implicitly when those fees are paid from grant money) likely would.
reply> paying out reviewers
replyReviewers are not usually paid.