The data Elsevier harvests (and sells)
Academics produce papers and give it to Elsevier for free. Academics referee the paper for free. Elsevier sells the papers back to Academics. This has been their business model for some time... but now they've found another way to monetize you. They sell your data.
Well isn't research fun? Publish or perish
in my field there are enough high quality journals that are published by societies and non profit publishers that we never need to publish with elsevier again.
but people still do!