If your peers thing that you need to cite the paper X because is relevant for the theme, you need to obtain it and pay for it. To decide to ignore parts of knowledge because you don't like its distribution mode is not an option.

The result will be less science, slower science and independent scientists being pushed out of the road. They would try to recruit them later under the ridiculous 'citizen scientists' category ('missionary scientists' would be an even better term), but this is what we have. Every single people trying to break monopolies or introduce changes for the benefit of the entire humanity in the past two decades has been laminated as a public warning for newcomers.