Heather Staines, writing for the Knowledge Futures Group‘s new Commonplace publication, in a post on scholarly infrastructure:
Publishing generally has long been an industry with a wide variety of offerings. However, the latter half of the twentieth century (and early twenty-first) has been characterized by increasing consolidation of content by four large publishers (Elsevier, Wiley, SpringerNature, and Taylor and Francis), who now controlling the vast majority of journal publications in Science, Technology, and Medicine. More recently, a similar consolidation has taken place among the technology vendors that online content providers depend upon to host their content. Atypon, for example, now owned by Wiley, hosts a bit less than 50% of English language journal content.
The reading list turned up some gems, including this 2018 Scholarly Kitchen post by Angela Cochran.