Am I missing something where it goes from reading Elsevier's books and using their site to making the leap to internet-wide surveillance?
From skimming through the SPARC report they cite it seems various findings are based on privacy policy language, one of which states that 'browsing history', 'search history' and 'interactions with our and other websites' may be collected, though this reads like it may just involve their own sites' analytics with only the latter involving other sites (which could be just outlinks but is unclear).
While the rest of the report seems to just cover some overviews of their own cookies and open-ended concerns about third-party scripts (which include general CDNs and their own analytics hosted by third-parties).