To address this specific point for people who might actually listen: my 11-month-old opens up some sort of AI-powered Google "assistant" on my phone when she finger-mashes it. I didn't install it and it doesn't even show up as an app in the apps list. When I eventually figured out how to disable it (not through disabling the AI assistant in the settings) Google warned me that my operating system might not work if I did so (spoilers: that's a scare tactic, the OS works just fine).
LLM-generated summaries are present in most search engines and turned on by default (I have switched engines to avoid this), but also, even when the search engine doesn't embed it, lots of the hits are LLM-SEO'd bullshit full of lies. If I want to find answers to perfectly normal questions I've got to wade through these and hope I can spot the real info amongst all the slop.
Cherry on top: human & bots are submitting slop to human-curated spaces like open-source projects and writing/art contests. They've effectively DDoS'd several, and behave badly when simply told "please don't submit LLM/GAN-generated content here." (Oh right, that's what this thread was about in the first place!)
So please don't try to act like this stuff is opt-in or we're choosing to see it. It is very literally being thrust into our attention often against our explicit wishes.