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T-Mobile secretly records iPhone screens and claims it's being helpful.
(www.droid-life.com)
This is a most excellent place for technology news and articles.
This requires special permissions and explicit user approval every time an app starts screen recording, plus it shows a red notification whenever screen recording is active.
I think you could get by with a one-time user approval as a device administration or assistive app permission, which you'd need to manually grant in Settings. Unlikely anyone would do that by accident.
That might be different for system-level apps. I haven't bought a carrier-branded phone in 10+ years so I'm not sure what that's like these days.
Last I checked, you can have a system app as an accessability provider and be enabled by default