Papers are funded by public money, produced on the back of volunteers. How utterly ridiculous indeed for an uninvolved third party to come in and charge a horrendous amount, whithout adding any value.
Yeah … Our paper got accepted! We conducted years of research, spent countless hours to analyze, interpret, & write the manuscript. Editors & reviewers voluntarily spent their time ensuring its quality. Now, we need to pay $4,430 so that you can read it. Isn't that ridiculous?