But, there are 2 perfectly capable home assistants on the market today that (right or wrong) aren't part of the same consumer-level narrative about privacy, and people like simple, straightforward, black-and-white narratives, like "Facebook cameras in your house are watching your child so that targeted ads can turn them into a nazi." That's a simple story, it's easy to remember and think about. Even ordinary, privacy-uneducated users like that story.
It's totally feasible to me that this device will flop due to privacy concerns. Scanning around quickly online, I can't see a single positive review (even from mainstream publications) that doesn't end with, "but of course Facebook is evil and you'd have to be stupid to trust them with a camera in your house."
I suspect Facebook just lost the narrative on this. They should have called it "Instagram Portal", and then the consumer situation would be completely different.
Most of my siblings have Alexa devices in their house. It's a privacy nightmare, but they don't care. Even so, none of them would be dumb enough to buy a Facebook portal. It's not even a sacrifice -- Alexa/Google work with more devices and have more features.