But regardless of that… it's totally plausible that a manufacturer could end up doing this, and as such it presents a risk vector. I can even see how it might be done semi-accidentally by a bad engineering team.
An even bigger risk is corporate-owned mesh networks, like Amazon Sidewalk. It's quite possible that TVs with Alexa support will end up also having access to this network, and will use your neighbour's Echo to ship data back even without you knowing. Or even a built-in LTE/5G transceiver.
Without strong regulation of privacy and consent, this will be a persistent and dangerous issue.