As far as JPMC goes, insider threats are the biggest threats they face. It makes sense from a security/compliance standpoint to "spy" on your employees, to a degree. Imagine if you could spy on your biggest enemy. You'd be dumb not to.

There are limits to everything, but for finservs, there's a reason why they do these things.

Source: I am/was infosec at JPMC and other large finservs.