Commonality used to be a Mertonian norm pre-WWII, when most of America did not even know what a physicist was; when anybody could apply and get into CalTech's graduate program; and when it was still possible to get funded following the science wherever it led the scientist.
From Science Education and Scientific Attitudes by Pravin Singh ...
"The norm of communality requires that scientific knowledge be held in common, in other words, the researcher is expected to share his findings with other scientists freely and without favor."
There seems to be a rising awareness that something important has been lost when knowledge becomes fragmented behind paywalls. But, there seems to not be such an awareness that we have strayed from a former ideal here.
My own take is that nobody should really be surprised, as scientists no longer even talk about striving for ideals, or ascribing to philosophy as a guide. If these things are happening somewhere, people who read the news on science simply aren't told about it. Physics, in particular, is thought to do just fine without interference from philosophers, as an example.
This publication price issue seems to fall into the broader problem of the fading of guidelines & ethics as core principles for scientific work. If people still ascribed to norms or ideals in science, as we once did, these paywalls would have been rejected long ago. So, what I would say, for those who have a problem with it: you might consider addressing the underlying root which allowed this to grow, in the first place. It did not just spring from a vacuum. There are other more fundamental problems here, which have facilitated this to happen. Strike at the root; not the symptom.