It seems that Express Scripts is simply reluctant to continue their business relationship with PillPack since they got too big and now pose a serious threat to

It seems that Express Scripts is simply reluctant to continue their business relationship with PillPack since they got too big and now pose a serious threat to their own business model (which probably relies on mail orders as well). It's of course understandable that they don't want to let a startup take away a profitable market segment from them, but it seems that they do this by making use of their market-controlling position, which is probably illegal (IMHO). Reading the article it's really hard to say what is really going on though as the journalist makes very little effort to uncover the real motivations behind the actions of the two companies.