I think we have to maintain those copyright rules provided by the Journals, however, open access published papers can be shared publicly. Furthermore, there is an option in Researchgate that allows you to keep a personal copy of your manuscript that can be shared as well but only privately if needed.
I understand the Laws and copyright rules. But how can we write a review or research paper without the help of RG and Sci-hub? I am just thinking if need to buy papers from journals for reading and getting knowledge's... As researcher and for general students it will be quite hard.
I agree completely and also concerned about this matter as I've faced this kind of situation back in 2010 while doing my masters in KU, Bangladesh. I think, all the journals should be freely accessible so that people could share, otherwise, research will be a kind of business someday.
I agree with what Mr. Md Ramim Tanver Rahman said and I just want to add a point that most journals give you a link which works for a limited time (usually not more than 50 days after acceptance) in case you would like to share your new published work with colleagues and others in the same major.