my guess is they are using google assistant ("hey google") processing stages in the query pipeline because they have an existing user base that is accustomed to its behavior.
ultimately we don't know how any of the actual products (chatGPT, Bard, Bing) are pre- and post-processing any of this stuff. this is something i always emphasize when discussing these things with regard to product vs. API offerings vs. the model itself. we don't know where the overlaps are or aren't. a lot of people haven't internalized the difference. they aren't the same.
ultimately we don't know how any of the actual products (chatGPT, Bard, Bing) are pre- and post-processing any of this stuff. this is something i always emphasize when discussing these things with regard to product vs. API offerings vs. the model itself. we don't know where the overlaps are or aren't. a lot of people haven't internalized the difference. they aren't the same.