Echo is a consequence of exploring digital appliances as marketing tools. If you're going to build a device which can voice-interface someone ordering 6 bottles of Tide with extreme ease, doesn't take much more to turn it into a nice music speaker and tell you weather & sports & jokes on request. Echo, Fire, etc are just extensions to feeding the retailing monster.
Do notice how Amazon's innovative foray into cell phones crashed & burned hard - despite being lauded as rather a well-built device. That shows how straying too far doesn't work, and that "far" isn't very.