Error message question/ remote mdm deployment on private iPhone?

Why do I keep getting the following Error message on iPhone Chrome and Safari for basic web searches on sites like airbnb:

FetchEvent.respondWith received an error: TypeError:Failed writing data to the file system.

Is it possible to remotely deploy mdm on iPhone with hidden profile so user is unaware the iPhone is restricted without consent, as a method of hacking and monitoring a private (non-business) mobile?

Enrolling a device in MDM requires either manually enrolling in the Settings app, or enrolling at the time that the device is initially set up (in Setup Assistant). In either case, a user can see whether the device is enrolled in MDM by looking at the main view of Settings, or in Settings > General > VPN & Device Management. Any applied restrictions can also be viewed there. And the error message does not sound like one that would result from a restriction anyway.

Error message question/ remote mdm deployment on private iPhone?
 
 
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