Make sure Automatic Updates is turned off in Settings.
Apart from that, limiting your exposure to AI is down to you. For example, when you realize that a YouTube video has an annoying AI voiceover, back out of it and select “Do not recommend this channel”.
Ignoring the AI blurb generated by searches becomes second nature after a while, as does ignoring the “summary” generated by Amazon every time you check customer reactions to products.
Thanks for the question. I hadn’t realized how I’ve been avoiding this unwelcome intrusion. I run iOS 26 and haven’t noticed anything untoward in day to day use.