> If the voice interface is implemented locally then it's not a problem.

That's not really observable or enforceable by me though. A question I ask myself all the time before I say yes to some kind of "new data tracking" is: "How do I think company_x will behave in 10 years if their profitability is plummeting?" Because I think that paints the worst case for companies that so far have been good actors.

I guess the TLDR is: That's great, but I think that the solution is legal protections for users. Right now all the power is in the hands of the collecting organization.