Academics sharing paywalled papers with a codeword on Twitter
The only "online piracy" I see here is when Elsevier demands US$30 from you to get a copy of a paper written by scientists paid for by your tax dollars, who paid Elsevier page fees to publish it.  Elsevier and similar companies are the thieves here, and they have a hell of a lot of nerve to be accusing scientists of "stealing" and "piracy" for working to create the very knowledge Elsevier shamelessly exploits.  (Even Elsevier's very name is a theft: they are attempting to free-ride on the goodwill of the Elzevir family of Renaissance publishers, who have no connection with them.)Do they have the law on their side?  Yeah.  So did the Pope when he sentenced Galileo to life in prison for promoting heliocentrism.  That doesn't mean they're in the right; that means the law is in the wrong.