I wouldn't consider it dead yet, but I do consider it a failed platform. (I've been intending to write a blog post on this.)
Alexa/Amazon is still going, but there are rumors that layoffs will disproportionately impact this division, Google has shut down their APIs unless you're wanting to integrate with an Android app, and Apple has never really opened up Siri.
As for why—it's so hard to build a business on the platforms. They are geared toward "get in and get out" interactions and for things like ordering a pizza, you've already got your phone on you. I still think voice has life, and I love using my devices, but it didn't take off how I thought it might.
Alexa/Amazon is still going, but there are rumors that layoffs will disproportionately impact this division, Google has shut down their APIs unless you're wanting to integrate with an Android app, and Apple has never really opened up Siri.
As for why—it's so hard to build a business on the platforms. They are geared toward "get in and get out" interactions and for things like ordering a pizza, you've already got your phone on you. I still think voice has life, and I love using my devices, but it didn't take off how I thought it might.