I think a lot of people just do not consider the implications, or are not concerned about them. For me, the turning point was a couple of years ago when I was chatting with a friend on their porch. He said he had bought a certain brand of western boots and really liked them: they were comfortable and reasonably priced. The very next day an ad for those exact boots appeared on my Facebook page. I dismissed that as a coincidence until I mentioned it to my son, who works in digital marketing. He said, matter of factly, of course, that is how the system works. Google Assistant on my phone picked up on the keyword.
Sure, Alexa, Siri, Bixby, and Google Assistant are (probably) not storing your conversations and spying on you. But they *are* constantly listening for not only triggers ("Alexa", "Siri", "OK Google") but keywords to market to advertisers. If that does not bother you, that's okay. But I disabled Google Assistant on my phone after that, and do not want anything like it monitoring me in my home, even though there's really nothing untoward or unusual going on.
I might consider something like Alexa if it demonstrably processed keyword monitoring locally, only going online on request, but who would make something like that? No particular profit potential.