A lot of research ends up behind expensive paywalls and not accessible to the public.
Almost all research articles are currently available on Sci-Hub, free of charge.
FYI Bulk download Sci-Hub papers.
I would also point out that even in my university, which pay millions of USD every year for journal subscriptions, I do not have access to many articles. I.e., even researchers don't have access to the findings of their colleagues, unless they bypass paywalls with sci-hub or other similar services.
