Bigger was better, since a larger game meant they packed in more content. Now the bloat is out of control since all game content is delivered over the Internet.
No, it was just especially egregious with Amazon in this scenario (and often in general with them …)
They had some promising technology and talent, but focused on what creativity they could cram into the flywheel instead of coming up with something good that could then later feed back into the ecosystem. The latter process can yield surprise successes like the Amazon Echo.