Perhaps unpopular and unconventional opinion of problems of peer review in science and academia:
Click to open/closeWorks published only in for profit journals inevitably have a conflict of interest and should be regarded as problematic for that reason. It also inhibits proper peer review. If a work can't be freely accessed and referred* to it shouldn't be regarded as a serious contribution to the scientific community.
* A reference to a work that isn't freely available is also highly problematic.