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Google assistant has an API here [0], and Alexa has a fairly large amount of documentation here [1]. In theory, the devices already claim to do this. If you don't trust that they do, you probably shouldn't have one full stop.

[0] https://developers.google.com/assistant/sdk/overview [1] https://developer.amazon.com/alexa

Involves more trust. This has the elegance of not needing to trust the megacorps any more than you care to.

How does this involve more trust?

With either Alias, or an homebrew solution you're sending the query portion ("How many teaspoons are in a tablespoon?") to the megacorp?

Whoops didn't see this part, yeah you're right!

>hardware device (eg Raspberry Pi) that listens for a wake up then sends to the API?

There's this: https://developers.google.com/assistant/sdk/