Jumping in with a small research just minutes before replying to this topic. If dev is serious with this idea --and I have to agree that it is a great feature, not many crypto payment service has this feature--, it probably will not be that difficult that it requires one whole year to develop.

Integrating voice assistant to our phone means we need to co-exist with siri or google assistant, or bixby if we count samsung user. I'm not sure about siri, but android allows us to replace google assistant with other voice assistant of our preference, like... Amazon's Alexa.

Now, Amazon have this project called VII (that's V-I-I, not roman numeral for 7) that basically integrates dozen of voice assistant under Alexa.

As Elitium already have this concept in mind (and roadmap) I would assume they have the general idea of what to do, how to build the app, etc., they can ride VII to achieve this roadmap easier.

Another benefit, that I can imagine, of integrating with Amazon will be an easier access to e-commerce as they're working with the giant e-commerce themselves. Thus, that bag for wivey's birthday is more approachable