Actually, quite a lot of articles are published by people in industry (e.g. pharmaceutical companies, biotech companies) for biology. Greg Cochran (a physicist by training, with no academic affiliation) publishes evolutionary biology articles in good journals, attends conferences, etc. You see more non-academics publishing when there are more people with the relevant skillsets outside academia, and fewer otherwise.
Actually, quite a lot of articles are published by people in industry (e.g. pharmaceutical companies, biotech companies) for biology. Greg Cochran (a physicist by training, with no academic affiliation) publishes evolutionary biology articles in good journals, attends conferences, etc. You see more non-academics publishing when there are more people with the relevant skillsets outside academia, and fewer otherwise.