1) Anyone can fall for a scam. Especially those who believe they wouldn't fall for a scam. This is why ridiculing those who fall for [a] scam is harmful, and serves scammers. 2) You can root a smartphone for someone else's usage. For example, I can install pmOS on a smartphone and hand it over to my kid.
You’re right, they just fall for installing updates or CLI tools which install compromised dependencies and run wild on a rooted system before getting caught 24 hours later.