You’ll soon be able to talk to Home Assistant without Google, Siri or Alexa (theverge.com)

I think the issue at the beginning will be the user base, those voice assistants are trained with huge number of re data and Home Assistan (with also something like a microphone) is used by few people compared to Alexa or Google.

Siri is already the dumbest of the 3 because it has less users/data.