Unnecessary caution
Apparently Google has improved voice synthesis to the point where it's really hard to distinguish from an actual human. Google pretends to be worried about this, and "independent" "thinkers" are
even more worried because RUSSIAN_BOTS caused
OUR LORDESS AND SAVIOURESS HILLARY to lose the 2016 election which was
HERS BY DIVINE RIGHT.
Google pretends that it will respond to their fake concerns by including a warning that the voice is electronic.
Unnecessary caution. You can already distinguish calls made by call centers. Whether the voice is software American or wetware Hindu, there's always a four-second 'hissy' pause before the voice starts, followed by an audible click. On the rare occasions when I have my phone bell turned on, this four-second pause gives me plenty of time to hang up before the spiel starts.