>They distribute set-top boxes with an integrated voice assistant. So, I would wager that is at least one source, and I would actually put down money that it is the only source. Cox Media Group doesn't make any claims about where they get the data or how much they have, and it seems like it would be very difficult to negotiate to get that data from the other major voice assistants.

There was a class action lawsuit back in 2019 alleging that Apple accidentally recording people's conversations with siri counted as wiretapping. If no enterprising lawyers has tried this lawsuit with cox, and no news articles has come out criticizing their broad ToS, it's probably safe to assume cox isn't doing it.