Alexa Google assistant and Siri were all significantly down sized in the last year or so (teams, product).

Turns out the top queries billions of dollars went into were to set timers or to play a song.

I would love to be proven wrong though.

I think part of the problem with these assistants is they are fucking annoying to use for all but the most trivial tasks. The only thing I've ever used Siri for more than once is "Siri, two minutes" - and sometimes she still tells me I don't have the timer app installed. The moment I can reliably get an answer to something I'm contemplating, it's going to have a huge impact on how much I use my phone.

I think that has to do with the nuance of programming a voice based flow that works for everyone. LLMs are on a different UX bandwidth.