"Generally I like supporting people's hard work" You did not support anyone's hard work. The researchers who wrote the paper receive none of the money paid to

"Generally I like supporting people's hard work" You did not support anyone's hard work. The researchers who wrote the paper receive none of the money paid to publishing companies, nor do the peer reviewers, and sometimes not even the editors (and in my experience, paid editors from Springer introduce more errors than they fix). Before the Internet, before TeX and related tools, those fees were needed to cover the cost of printing copies journals and shipping them to libraries. Prior to the 1970s academic publishers were typically run by universities and charged only break-even fees, and few complained because there was no better alternative that could effectively spread academic research around. Then a bunch of commercial publishers began eyeing academic journals (probably because they knew they would never have to pay the authors) and from the 1980s onward academic publishing has been for-profit. Instead of going away when the Internet rendered printed journals obsolete, these companies have instead opted to not print most journals and charge fees for online access.