I'm pretty sure it's optimized to listen for a single hotword and then initiate the network connection to process what comes next. What people accuse Facebook

I'm pretty sure it's optimized to listen for a single hotword and then initiate the network connection to process what comes next. What people accuse Facebook of doing would require constant processing of the audio stream for random interesting tokens. Either process on device and then send metadata (more battery, less network) or send the raw stream and process on the server (less battery, more network).