I feel like people are getting outraged at the title. This isn't a keylogger. It's recording keystroke/mouse patterns to create behavioral profiles, not monitor content. It's just to try to heuristically detect whether the wrong person is operating an account.
There's more to it than that though. As the article notes, Amazon are ruthless when it comes to squeezing every last drop out of their workers. Sure, this software is _currently_ going to be used to try and reduce imposter attacks, but given their reputation I don't think it's unreasonable to see this as potentially leading to increased surveillance of their workers (which will be marketed as 'helping increase productivity'). I would wager that this is why people are getting bent out of shape over the article.
I mean, I guess that could happen. But it's not clear why we should be upset about something that might happen in the future. This software doesn't really get us any closer or further from that happening.
If Amazon wanted to keylog its employees, they'd just create a keylogger for that purpose, not repurpose this thing.